misc: make edit post directly

_includes/article-header.html

@@ -30,7 +30,7 @@
           {%- else -%}
             {%- assign _article_path = include.article.path -%}
           {%- endif -%}
-          {%- assign _github_path = site.repository | append: '/tree/' | append: site.repository_tree | append: '/' | append: _article_path | replace:'//','/' -%}
+          {%- assign _github_path = site.repository | append: '/edit/' | append: site.repository_tree | append: '/' | append: _article_path | replace:'//','/' -%}
           <span class="split-space">&nbsp;</span>
           <a class="edit-on-github"
             title="{{ _locale_post_on_github }}"