diff --git a/docs/index.md b/docs/index.md
index efcde10..765ed59 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -8,11 +8,11 @@ status: new
 
 ???+ tip "The Coder Cafe"
 
-    If you enjoyed my book, you may be interested in my latest project: [The Coder Cafe](https://thecoder.cafe), a daily newsletter for coders.
+    If you enjoyed my book, you may be interested in my latest project: [The Coder Cafe](https://thecoder.cafe?rd=100go.co), a daily newsletter for coders.
 
     > Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.
 
-    <center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
+    <center><a href="https://thecoder.cafe?rd=100go.co"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
 
 This page is a summary of the mistakes in the [100 Go Mistakes and How to Avoid Them book](book.md). Meanwhile, it's also open to the community. If you believe that a common Go mistake should be added, please create an [issue](https://github.com/teivah/100-go-mistakes/issues/new?assignees=&labels=community+mistake&template=community_mistake.md&title=).
 
diff --git a/docs/ja.md b/docs/ja.md
index 5332eca..eb761ce 100644
--- a/docs/ja.md
+++ b/docs/ja.md
@@ -7,11 +7,11 @@ comments: true
 
 ???+ tip "The Coder Cafe"
 
-    もし私の本を楽しんでいただけたなら、私の最新プロジェクトにもご興味があるかもしれません。[The Coder Cafe](https://thecoder.cafe)は、コーダー向けの日刊ニュースレターです。
+    もし私の本を楽しんでいただけたなら、私の最新プロジェクトにもご興味があるかもしれません。[The Coder Cafe](https://thecoder.cafe?rd=100go.co/ja)は、コーダー向けの日刊ニュースレターです。
 
     > Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.
 
-    <center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
+    <center><a href="https://thecoder.cafe?rd=100go.co/ja"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
 
 このページは『100 Go Mistakes』の内容をまとめたものです。一方で、コミュニティに開かれたページでもあります。「ありがちな間違い」が新たに追加されるべきだとお考えでしたら [community mistake issue](https://github.com/teivah/100-go-mistakes/issues/new?assignees=&labels=community+mistake&template=community_mistake.md&title=) を作成してください。
 
diff --git a/docs/pt-br.md b/docs/pt-br.md
index caef215..81e6001 100644
--- a/docs/pt-br.md
+++ b/docs/pt-br.md
@@ -7,11 +7,11 @@ comments: true
 
 ???+ tip "The Coder Cafe"
 
-    Se você gostou do meu livro, talvez se interesse pelo meu novo projeto: [The Coder Cafe](https://thecoder.cafe), uma newsletter diária para programadores.
+    Se você gostou do meu livro, talvez se interesse pelo meu novo projeto: [The Coder Cafe](https://thecoder.cafe?rd=100go.co/pt-br), uma newsletter diária para programadores.
 
     > Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.
 
-    <center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
+    <center><a href="https://thecoder.cafe?rd=100go.co/pt-br"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
 
 Esta página é um resumo dos erros do [100 Go Mistakes and How to Avoid Them book](book.md). Enquanto isso, também está aberto à comunidade. Se você acredita que um erro comum do Go deve ser adicionado, crie uma [issue](https://github.com/teivah/100-go-mistakes/issues/new?assignees=&labels=community+mistake&template=community_mistake.md&title=).
 
diff --git a/docs/zh.md b/docs/zh.md
index b967c7e..704b408 100644
--- a/docs/zh.md
+++ b/docs/zh.md
@@ -7,11 +7,11 @@ comments: true
 
 ???+ tip "The Coder Cafe"
 
-    如果您喜欢我的书，您可能会对我的最新项目感兴趣：[The Coder Cafe](https://thecoder.cafe)，这是一个为程序员提供的每日简报。
+    如果您喜欢我的书，您可能会对我的最新项目感兴趣：[The Coder Cafe](https://thecoder.cafe?rd=100go.co/zh)，这是一个为程序员提供的每日简报。
 
     > Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.
 
-    <center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
+    <center><a href="https://thecoder.cafe?rd=100go.co/zh"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center>
 
 ![](img/inside-cover.png)
 
diff --git a/overrides/main.html b/overrides/main.html
index 402de72..94d9808 100644
--- a/overrides/main.html
+++ b/overrides/main.html
@@ -1,16 +1 @@
 {% extends "base.html" %}
-
-{% block extrahead %}
-  {{ super() }}
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-{% endblock %}
-
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-  {{ super() }}
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-{% endblock %}
diff --git a/site/20-slice/index.html b/site/20-slice/index.html
index 8a5827c..642bc82 100644
--- a/site/20-slice/index.html
+++ b/site/20-slice/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
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-  
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\ No newline at end of file
diff --git a/site/28-maps-memory-leaks/index.html b/site/28-maps-memory-leaks/index.html
index 9dd5148..a1f61ef 100644
--- a/site/28-maps-memory-leaks/index.html
+++ b/site/28-maps-memory-leaks/index.html
@@ -93,13 +93,6 @@
       
     
     
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diff --git a/site/404.html b/site/404.html
index e7cd4e7..103abf1 100644
--- a/site/404.html
+++ b/site/404.html
@@ -61,13 +61,6 @@
     
     
     
-  
-  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
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-
   </head>
   
   
@@ -966,12 +959,8 @@ <h1>404 - Not found</h1>
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-  
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-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
-                  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
-
   </body>
 </html>
\ No newline at end of file
diff --git a/site/5-interface-pollution/index.html b/site/5-interface-pollution/index.html
index d3c063a..a1d5d6e 100644
--- a/site/5-interface-pollution/index.html
+++ b/site/5-interface-pollution/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
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diff --git a/site/56-concurrency-faster/index.html b/site/56-concurrency-faster/index.html
index a72a623..e46c33a 100644
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+++ b/site/56-concurrency-faster/index.html
@@ -93,13 +93,6 @@
       
     
     
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diff --git a/site/89-benchmarks/index.html b/site/89-benchmarks/index.html
index 7f7c1db..5c90728 100644
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+++ b/site/89-benchmarks/index.html
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diff --git a/site/9-generics/index.html b/site/9-generics/index.html
index c3b2cb6..a32df71 100644
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diff --git a/site/92-false-sharing/index.html b/site/92-false-sharing/index.html
index 19f08ce..1520582 100644
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@@ -1204,12 +1197,8 @@ <h2 id="__comments">Comments</h2>
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-  
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 </html>
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diff --git a/site/98-profiling-execution-tracing/index.html b/site/98-profiling-execution-tracing/index.html
index a851140..129c092 100644
--- a/site/98-profiling-execution-tracing/index.html
+++ b/site/98-profiling-execution-tracing/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
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@@ -1557,12 +1550,8 @@ <h2 id="__comments">Comments</h2>
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 </html>
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diff --git a/site/book/index.html b/site/book/index.html
index 7f92d88..cd43cd2 100644
--- a/site/book/index.html
+++ b/site/book/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
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-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
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 </html>
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diff --git a/site/chapter-1/index.html b/site/chapter-1/index.html
index c2aafc3..d3000fe 100644
--- a/site/chapter-1/index.html
+++ b/site/chapter-1/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
-  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
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     html.glightbox-open { overflow: initial; height: 100%; }
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@@ -1404,12 +1397,8 @@ <h2 id="summary">Summary</h2>
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-  
       <script src="../assets/javascripts/bundle.8fd75fb4.min.js"></script>
       
     
-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
-                  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
-
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 </html>
\ No newline at end of file
diff --git a/site/external/index.html b/site/external/index.html
index db361dd..025e3ee 100644
--- a/site/external/index.html
+++ b/site/external/index.html
@@ -91,13 +91,6 @@
       
     
     
-  
-  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
-        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
-      j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
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     html.glightbox-open { overflow: initial; height: 100%; }
     .gslide-title { margin-top: 0px; user-select: text; }
@@ -1523,12 +1516,8 @@ <h3 id="um-otimo-livro-para-programadores-go">Um ÓTIMO livro para programadores
     <script id="__config" type="application/json">{"base": "..", "features": ["navigation.tabs", "navigation.tabs.sticky", "search.highlight", "search.share", "search.suggest", "content.code.copy", "navigation.expand", "navigation.sections", "announce.dismiss", "toc.follow", "content.code.annotate", "content.tooltips"], "search": "../assets/javascripts/workers/search.b8dbb3d2.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
     
     
-  
       <script src="../assets/javascripts/bundle.8fd75fb4.min.js"></script>
       
     
-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
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 </html>
\ No newline at end of file
diff --git a/site/index.html b/site/index.html
index b9ce415..5dbe018 100644
--- a/site/index.html
+++ b/site/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
-  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
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@@ -3427,11 +3420,11 @@
 <h1 id="common-go-mistakes">Common Go Mistakes</h1>
 <details class="tip" open="open">
 <summary>The Coder Cafe</summary>
-<p>If you enjoyed my book, you may be interested in my latest project: <a href="https://thecoder.cafe">The Coder Cafe</a>, a daily newsletter for coders.</p>
+<p>If you enjoyed my book, you may be interested in my latest project: <a href="https://thecoder.cafe?rd=100go.co">The Coder Cafe</a>, a daily newsletter for coders.</p>
 <blockquote>
 <p>Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.</p>
 </blockquote>
-<p><center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
+<p><center><a href="https://thecoder.cafe?rd=100go.co"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
 </details>
 <p>This page is a summary of the mistakes in the <a href="book/">100 Go Mistakes and How to Avoid Them book</a>. Meanwhile, it's also open to the community. If you believe that a common Go mistake should be added, please create an <a href="https://github.com/teivah/100-go-mistakes/issues/new?assignees=&amp;labels=community+mistake&amp;template=community_mistake.md&amp;title=">issue</a>.</p>
 <p><a class="glightbox" href="img/inside-cover.png" data-type="image" data-width="auto" data-height="auto" data-desc-position="bottom"><img alt="" src="img/inside-cover.png" /></a></p>
@@ -5392,12 +5385,8 @@ <h2 id="__comments">Comments</h2>
     <script id="__config" type="application/json">{"base": ".", "features": ["navigation.tabs", "navigation.tabs.sticky", "search.highlight", "search.share", "search.suggest", "content.code.copy", "navigation.expand", "navigation.sections", "announce.dismiss", "toc.follow", "content.code.annotate", "content.tooltips"], "search": "assets/javascripts/workers/search.b8dbb3d2.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
     
     
-  
       <script src="assets/javascripts/bundle.8fd75fb4.min.js"></script>
       
     
-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
-                  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
-
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 </html>
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diff --git a/site/ja/index.html b/site/ja/index.html
index ba46457..6cdc213 100644
--- a/site/ja/index.html
+++ b/site/ja/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
-  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
-        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
-      j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
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-  })(window,document,'script','dataLayer','GTM-WTPX6GZT');</script>
-
    <link href="../assets/stylesheets/glightbox.min.css" rel="stylesheet"/><style>
     html.glightbox-open { overflow: initial; height: 100%; }
     .gslide-title { margin-top: 0px; user-select: text; }
@@ -3353,11 +3346,11 @@
 <h1 id="go">Go言語でありがちな間違い</h1>
 <details class="tip" open="open">
 <summary>The Coder Cafe</summary>
-<p>もし私の本を楽しんでいただけたなら、私の最新プロジェクトにもご興味があるかもしれません。<a href="https://thecoder.cafe">The Coder Cafe</a>は、コーダー向けの日刊ニュースレターです。</p>
+<p>もし私の本を楽しんでいただけたなら、私の最新プロジェクトにもご興味があるかもしれません。<a href="https://thecoder.cafe?rd=100go.co/ja">The Coder Cafe</a>は、コーダー向けの日刊ニュースレターです。</p>
 <blockquote>
 <p>Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.</p>
 </blockquote>
-<p><center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
+<p><center><a href="https://thecoder.cafe?rd=100go.co/ja"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
 </details>
 <p>このページは『100 Go Mistakes』の内容をまとめたものです。一方で、コミュニティに開かれたページでもあります。「ありがちな間違い」が新たに追加されるべきだとお考えでしたら <a href="https://github.com/teivah/100-go-mistakes/issues/new?assignees=&amp;labels=community+mistake&amp;template=community_mistake.md&amp;title=">community mistake issue</a> を作成してください。</p>
 <p><a class="glightbox" href="../img/inside-cover.png" data-type="image" data-width="auto" data-height="auto" data-desc-position="bottom"><img alt="" src="../img/inside-cover.png" /></a></p>
@@ -5009,12 +5002,8 @@ <h2 id="__comments">Comments</h2>
     <script id="__config" type="application/json">{"base": "..", "features": ["navigation.tabs", "navigation.tabs.sticky", "search.highlight", "search.share", "search.suggest", "content.code.copy", "navigation.expand", "navigation.sections", "announce.dismiss", "toc.follow", "content.code.annotate", "content.tooltips"], "search": "../assets/javascripts/workers/search.b8dbb3d2.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
     
     
-  
       <script src="../assets/javascripts/bundle.8fd75fb4.min.js"></script>
       
     
-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
-                  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
-
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diff --git a/site/pt-br/index.html b/site/pt-br/index.html
index cfc4beb..53792aa 100644
--- a/site/pt-br/index.html
+++ b/site/pt-br/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
-  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
-        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
-      j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
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-  })(window,document,'script','dataLayer','GTM-WTPX6GZT');</script>
-
    <link href="../assets/stylesheets/glightbox.min.css" rel="stylesheet"/><style>
     html.glightbox-open { overflow: initial; height: 100%; }
     .gslide-title { margin-top: 0px; user-select: text; }
@@ -3419,11 +3412,11 @@
 <h1 id="erros-comuns-de-go">Erros comuns de Go</h1>
 <details class="tip" open="open">
 <summary>The Coder Cafe</summary>
-<p>Se você gostou do meu livro, talvez se interesse pelo meu novo projeto: <a href="https://thecoder.cafe">The Coder Cafe</a>, uma newsletter diária para programadores.</p>
+<p>Se você gostou do meu livro, talvez se interesse pelo meu novo projeto: <a href="https://thecoder.cafe?rd=100go.co/pt-br">The Coder Cafe</a>, uma newsletter diária para programadores.</p>
 <blockquote>
 <p>Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.</p>
 </blockquote>
-<p><center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
+<p><center><a href="https://thecoder.cafe?rd=100go.co/pt-br"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
 </details>
 <p>Esta página é um resumo dos erros do <a href="../book/">100 Go Mistakes and How to Avoid Them book</a>. Enquanto isso, também está aberto à comunidade. Se você acredita que um erro comum do Go deve ser adicionado, crie uma <a href="https://github.com/teivah/100-go-mistakes/issues/new?assignees=&amp;labels=community+mistake&amp;template=community_mistake.md&amp;title=">issue</a>.</p>
 <p><a class="glightbox" href="../img/inside-cover.png" data-type="image" data-width="auto" data-height="auto" data-desc-position="bottom"><img alt="" src="../img/inside-cover.png" /></a></p>
@@ -5394,12 +5387,8 @@ <h2 id="__comments">Comments</h2>
     <script id="__config" type="application/json">{"base": "..", "features": ["navigation.tabs", "navigation.tabs.sticky", "search.highlight", "search.share", "search.suggest", "content.code.copy", "navigation.expand", "navigation.sections", "announce.dismiss", "toc.follow", "content.code.annotate", "content.tooltips"], "search": "../assets/javascripts/workers/search.b8dbb3d2.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
     
     
-  
       <script src="../assets/javascripts/bundle.8fd75fb4.min.js"></script>
       
     
-  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WTPX6GZT"
-                  height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
-
   <script>document$.subscribe(() => {const lightbox = GLightbox({"touchNavigation": true, "loop": false, "zoomable": true, "draggable": true, "openEffect": "zoom", "closeEffect": "zoom", "slideEffect": "slide"});})</script></body>
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diff --git a/site/sitemap.xml.gz b/site/sitemap.xml.gz
index 318257e..ca191f3 100644
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diff --git a/site/zh/index.html b/site/zh/index.html
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--- a/site/zh/index.html
+++ b/site/zh/index.html
@@ -93,13 +93,6 @@
       
     
     
-  
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@@ -3173,11 +3166,11 @@
 <h1 id="100-go">100 个 Go 常见错误及如何避免</h1>
 <details class="tip" open="open">
 <summary>The Coder Cafe</summary>
-<p>如果您喜欢我的书，您可能会对我的最新项目感兴趣：<a href="https://thecoder.cafe">The Coder Cafe</a>，这是一个为程序员提供的每日简报。</p>
+<p>如果您喜欢我的书，您可能会对我的最新项目感兴趣：<a href="https://thecoder.cafe?rd=100go.co/zh">The Coder Cafe</a>，这是一个为程序员提供的每日简报。</p>
 <blockquote>
 <p>Feeling overwhelmed by the endless stream of tech content? At The Coder Cafe, we serve one essential concept for coders daily. Written by a senior software engineer at Google, it's perfectly brewed for your morning coffee, helping you grow your skills deeply.</p>
 </blockquote>
-<p><center><a href="https://thecoder.cafe"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
+<p><center><a href="https://thecoder.cafe?rd=100go.co/zh"><img src="../img/thecodercafe.png" alt="" style="width:480px;height:240px;"></a></center></p>
 </details>
 <p><a class="glightbox" href="../img/inside-cover.png" data-type="image" data-width="auto" data-height="auto" data-desc-position="bottom"><img alt="" src="../img/inside-cover.png" /></a></p>
 <h2 id="_1">代码及工程组织</h2>
@@ -3640,12 +3633,8 @@ <h2 id="__comments">Comments</h2>
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