diff --git a/site/_includes/docs_contents.html b/site/_includes/docs_contents.html
index 909832f4..35904fbf 100644
--- a/site/_includes/docs_contents.html
+++ b/site/_includes/docs_contents.html
@@ -2,43 +2,43 @@
   <aside>
     <h4>Getting Started</h4>
     <ul>
-      <li class="{% if page.title == "Welcome" %}current{% endif %}">
+      <li class="{% if page.title == 'Welcome' %}current{% endif %}">
         <a href="{{ site.url }}/docs/home">Welcome</a>
       </li>
-      <li class="{% if page.title == "Quick-start guide" %}current{% endif %}">
+      <li class="{% if page.title == 'Quick-start guide' %}current{% endif %}">
         <a href="{{ site.url }}/docs/quickstart">Quick-start guide</a>
       </li>
-      <li class="{% if page.title == "Installation" %}current{% endif %}">
+      <li class="{% if page.title == 'Installation' %}current{% endif %}">
         <a href="{{ site.url }}/docs/installation">Installation</a>
       </li>
-      <li class="{% if page.title == "Basic Usage" %}current{% endif %}">
+      <li class="{% if page.title == 'Basic Usage' %}current{% endif %}">
         <a href="{{ site.url }}/docs/usage">Basic Usage</a>
       </li>
-      <li class="{% if page.title == "Directory structure" %}current{% endif %}">
+      <li class="{% if page.title == 'Directory structure' %}current{% endif %}">
         <a href="{{ site.url }}/docs/structure">Directory structure</a>
       </li>
-      <li class="{% if page.title == "Configuration" %}current{% endif %}">
+      <li class="{% if page.title == 'Configuration' %}current{% endif %}">
         <a href="{{ site.url }}/docs/configuration">Configuration</a>
       </li>
     </ul>
     <h4>Your Content</h4>
     <ul>
-      <li class="{% if page.title == "Front-matter" %}current{% endif %}">
+      <li class="{% if page.title == 'Front-matter' %}current{% endif %}">
         <a href="{{ site.url }}/docs/frontmatter">Front-matter</a>
       </li>
-      <li class="{% if page.title == "Writing posts" %}current{% endif %}">
+      <li class="{% if page.title == 'Writing posts' %}current{% endif %}">
         <a href="{{ site.url }}/docs/posts">Writing posts</a>
       </li>
-      <li class="{% if page.title == "Working with drafts" %}current{% endif %}">
+      <li class="{% if page.title == 'Working with drafts' %}current{% endif %}">
         <a href="{{ site.url }}/docs/drafts">Working with drafts</a>
       </li>
-      <li class="{% if page.title == "Creating pages" %}current{% endif %}">
+      <li class="{% if page.title == 'Creating pages' %}current{% endif %}">
         <a href="{{ site.url }}/docs/pages">Creating pages</a>
       </li>
-      <li class="{% if page.title == "Variables" %}current{% endif %}">
+      <li class="{% if page.title == 'Variables' %}current{% endif %}">
         <a href="{{ site.url }}/docs/variables">Variables</a>
       </li>
-      <li class="{% if page.title == "Blog migrations" %}current{% endif %}">
+      <li class="{% if page.title == 'Blog migrations' %}current{% endif %}">
         <a href="{{ site.url }}/docs/migrations">Blog migrations</a>
       </li>
     </ul>