diff --git a/index.html b/index.html
index 3d908e1..f2351ed 100644
--- a/index.html
+++ b/index.html
@@ -701,7 +701,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Docker Version Output Example</h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
+<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
 <div class="accordion-body">
 <pre><code>Client: Docker Engine - Community
  Version:           20.10.13
@@ -752,7 +752,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Cwltool Version Output Example</h3>
 </button>
-<div id="collapseSpoiler2" class="accordion-collapse collapse" aria-labelledby="headingSpoiler2" data-bs-parent="#accordionSpoiler2">
+<div id="collapseSpoiler2" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler2" aria-labelledby="headingSpoiler2">
 <div class="accordion-body">
 <pre><code>/home/learner/env/bin/cwltool 3.1.20220224085855</code></pre>
 </div>
@@ -776,7 +776,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler3">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Graphviz version output example</h3>
 </button>
-<div id="collapseSpoiler3" class="accordion-collapse collapse" aria-labelledby="headingSpoiler3" data-bs-parent="#accordionSpoiler3">
+<div id="collapseSpoiler3" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler3" aria-labelledby="headingSpoiler3">
 <div class="accordion-body">
 <pre><code>dot - graphviz version 2.43.0 (0)</code></pre>
 </div>
@@ -956,7 +956,7 @@ <h3 id="star-genome-index">STAR Genome index<a class="anchor" aria-label="anchor
   <h3 class="accordion-header" id="headingSpoiler4">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Option 1: Download the index</h3>
 </button>
-<div id="collapseSpoiler4" class="accordion-collapse collapse" aria-labelledby="headingSpoiler4" data-bs-parent="#accordionSpoiler4">
+<div id="collapseSpoiler4" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler4" aria-labelledby="headingSpoiler4">
 <div class="accordion-body">
 <p>At least 9 GB of memory is required to generate the index, which will
 occupy 3.3GB of disk.</p>
@@ -979,7 +979,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler5">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Option 2: Generate the index yourself</h3>
 </button>
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+<div id="collapseSpoiler5" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler5" aria-labelledby="headingSpoiler5">
 <div class="accordion-body">
 <p>To generate the genome index yourself: create a new file named
 <code>dm6-star-index.yaml</code> in the the
@@ -1060,7 +1060,7 @@ <h4 id="setting-the-checksum-">Setting the checksum.<a class="anchor" aria-label
   <h3 class="accordion-header" id="headingSpoiler6">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>rnaseq.md5</h3>
 </button>
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb38">
 <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1096,7 +1096,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler7">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>make_md5.sh</h3>
 </button>
-<div id="collapseSpoiler7" class="accordion-collapse collapse" aria-labelledby="headingSpoiler7" data-bs-parent="#accordionSpoiler7">
+<div id="collapseSpoiler7" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler7" aria-labelledby="headingSpoiler7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb39">
 <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1142,7 +1142,7 @@ <h4 id="checking-your-files">Checking your files<a class="anchor" aria-label="an
   <h3 class="accordion-header" id="headingSpoiler8">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>md5sum check command outputs</h3>
 </button>
-<div id="collapseSpoiler8" class="accordion-collapse collapse" aria-labelledby="headingSpoiler8" data-bs-parent="#accordionSpoiler8">
+<div id="collapseSpoiler8" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler8" aria-labelledby="headingSpoiler8">
 <div class="accordion-body">
 <p>We expect the following outputs from this command:</p>
 <pre><code><span><span class="va">Drosophila_melanogaster.BDGP6.87.gtf</span><span class="op">:</span> <span class="va">OK</span></span>
diff --git a/instructor/index.html b/instructor/index.html
index 2e20451..75d8809 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -765,7 +765,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Docker Version Output Example</h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
+<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
 <div class="accordion-body">
 <pre><code>Client: Docker Engine - Community
  Version:           20.10.13
@@ -816,7 +816,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Cwltool Version Output Example</h3>
 </button>
-<div id="collapseSpoiler2" class="accordion-collapse collapse" aria-labelledby="headingSpoiler2" data-bs-parent="#accordionSpoiler2">
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 <div class="accordion-body">
 <pre><code>/home/learner/env/bin/cwltool 3.1.20220224085855</code></pre>
 </div>
@@ -840,7 +840,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler3">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Graphviz version output example</h3>
 </button>
-<div id="collapseSpoiler3" class="accordion-collapse collapse" aria-labelledby="headingSpoiler3" data-bs-parent="#accordionSpoiler3">
+<div id="collapseSpoiler3" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler3" aria-labelledby="headingSpoiler3">
 <div class="accordion-body">
 <pre><code>dot - graphviz version 2.43.0 (0)</code></pre>
 </div>
@@ -1020,7 +1020,7 @@ <h3 id="star-genome-index">STAR Genome index<a class="anchor" aria-label="anchor
   <h3 class="accordion-header" id="headingSpoiler4">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Option 1: Download the index</h3>
 </button>
-<div id="collapseSpoiler4" class="accordion-collapse collapse" aria-labelledby="headingSpoiler4" data-bs-parent="#accordionSpoiler4">
+<div id="collapseSpoiler4" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler4" aria-labelledby="headingSpoiler4">
 <div class="accordion-body">
 <p>At least 9 GB of memory is required to generate the index, which will
 occupy 3.3GB of disk.</p>
@@ -1043,7 +1043,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler5">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Option 2: Generate the index yourself</h3>
 </button>
-<div id="collapseSpoiler5" class="accordion-collapse collapse" aria-labelledby="headingSpoiler5" data-bs-parent="#accordionSpoiler5">
+<div id="collapseSpoiler5" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler5" aria-labelledby="headingSpoiler5">
 <div class="accordion-body">
 <p>To generate the genome index yourself: create a new file named
 <code>dm6-star-index.yaml</code> in the the
@@ -1124,7 +1124,7 @@ <h4 id="setting-the-checksum-">Setting the checksum.<a class="anchor" aria-label
   <h3 class="accordion-header" id="headingSpoiler6">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>rnaseq.md5</h3>
 </button>
-<div id="collapseSpoiler6" class="accordion-collapse collapse" aria-labelledby="headingSpoiler6" data-bs-parent="#accordionSpoiler6">
+<div id="collapseSpoiler6" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler6" aria-labelledby="headingSpoiler6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb38">
 <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1160,7 +1160,7 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   <h3 class="accordion-header" id="headingSpoiler7">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>make_md5.sh</h3>
 </button>
-<div id="collapseSpoiler7" class="accordion-collapse collapse" aria-labelledby="headingSpoiler7" data-bs-parent="#accordionSpoiler7">
+<div id="collapseSpoiler7" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler7" aria-labelledby="headingSpoiler7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb39">
 <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1206,7 +1206,7 @@ <h4 id="checking-your-files">Checking your files<a class="anchor" aria-label="an
   <h3 class="accordion-header" id="headingSpoiler8">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>md5sum check command outputs</h3>
 </button>
-<div id="collapseSpoiler8" class="accordion-collapse collapse" aria-labelledby="headingSpoiler8" data-bs-parent="#accordionSpoiler8">
+<div id="collapseSpoiler8" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler8" aria-labelledby="headingSpoiler8">
 <div class="accordion-body">
 <p>We expect the following outputs from this command:</p>
 <pre><code><span><span class="va">Drosophila_melanogaster.BDGP6.87.gtf</span><span class="op">:</span> <span class="va">OK</span></span>
diff --git a/md5sum.txt b/md5sum.txt
index b343e0e..71cc310 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -4,7 +4,7 @@
 "config.yaml" "75323286755b184e154f3123eb45ef38" "site/built/config.yaml" "2024-05-08"
 "index.md" "000a1a2b1e4e4f274b3dbff311b49818" "site/built/index.md" "2024-05-08"
 "links.md" "8184cf4149eafbf03ce8da8ff0778c14" "site/built/links.md" "2024-05-08"
-"episodes/01-introduction.Rmd" "3b422bc89b2599ae059f068eafe2e5fc" "site/built/01-introduction.md" "2024-05-08"
+"episodes/01-introduction.Rmd" "d32b6b5562a66dc90d79acbf60210375" "site/built/01-introduction.md" "2024-05-08"
 "episodes/02-shell_to_cwl.Rmd" "9d08ba8ae7875dee96e8f80de70907ea" "site/built/02-shell_to_cwl.md" "2024-05-08"
 "episodes/03-dependency_graphs.Rmd" "7f3e9f2f9770304319f9549ef5335daa" "site/built/03-dependency_graphs.md" "2024-05-08"
 "episodes/04-reusing_tools.Rmd" "4a90245e02110dbb13296102d3ce75a2" "site/built/04-reusing_tools.md" "2024-05-08"
diff --git a/pkgdown.yml b/pkgdown.yml
index abe4d0a..3f9162c 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 3.1.11
 pkgdown: 2.0.9
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-05-08T22:37Z
+last_built: 2024-05-08T22:38Z