fix: wrong relative url in sidebar extensions (#1)

_includes/sidebar/archive-list.html

@@ -6,5 +6,5 @@
 
 {% assign keys = datetimes %}
 {% assign field = 'date' %}
-{% assign url = '/archives.html' %}
+{% assign url = '/archives.html' | relative_url %}
 {% include sidebar/common-list.html %}

_includes/sidebar/category-list.html

@@ -5,5 +5,5 @@
 
 {% assign keys = categories %}
 {% assign field = 'categories' %}
-{% assign url = '/categories.html' %}
+{% assign url = '/categories.html' | relative_url %}
 {% include sidebar/common-list.html %}

_includes/sidebar/common-list.html

@@ -9,7 +9,7 @@
 <div class="common-list">
   <ul>
     <li>
-      <a href="/index.html">
+      <a href="{{ '/index.html' | relative_url }}">
         All<span>{{ site.posts.size }}</span>
       </a>
     </li>

_includes/sidebar/tag-list.html

@@ -5,5 +5,5 @@
 
 {% assign keys = tags %}
 {% assign field = 'tags' %}
-{% assign url = '/tags.html' %}
+{% assign url = '/tags.html' | relative_url %}
 {%- include sidebar/common-list.html -%}