fix for categories broken links with subfolder usage

Author: morm

source/_includes/archive_post.html

@@ -3,6 +3,6 @@ <h2><a href="{{ site.url }}{{ post.url }}">{% if site.titlecase %}{{ post.title
 <time datetime="{{ post.date | datetime | date_to_xmlschema }}" pubdate>{{ post.date | date: "<span class='month'>%b</span> <span class='day'>%d</span> <span class='year'>%Y</span>"}}</time>
 {% if category != '0' %}
 <footer>
-  <span class="categories meta">posted in {{ post.categories | category_links }}</span>
+  <span class="categories meta">posted in {{ post.categories | category_links | expand_urls: site.url }}</span>
 </footer>
 {% endif %}

source/_includes/post/categories.html

@@ -5,7 +5,7 @@
   {% if post %}
     {{ post.categories | category_links }}
   {% else %}
-    {{ page.categories | category_links }}
+    {{ page.categories | category_links | expand_urls: root_url }}
   {% endif %}
 </span>
 {% endunless %}