Include category links on category pages.

_includes/category_menu_top.html

@@ -0,0 +1,9 @@
+<div class="category-menu">
+  {% for category in site.category_metadata %}
+    <span class="category-link">
+      <a href="/{{category.first}}">
+        {{ category.last["title"] }}
+      </a>
+    </span>
+  {% endfor %}
+</div>

_layouts/category_index.html

@@ -2,7 +2,8 @@
 layout: default
 ---
 <article class="post">
-
+  {% include category_menu_top.html %}
+  
   <header class="post-header">
     <h1 class="post-title">{{ page.title }}</h1>
   </header>

index.html

@@ -2,15 +2,7 @@
 layout: default
 ---
 <div class="home">
-  <div class="category-menu">
-    {% for category in site.category_metadata %}
-        <span class="category-link">
-          <a href="{{category.first | prepend: site.baseurl}}">
-            {{ category.last["title"] }}
-          </a>
-        </span>
-    {% endfor %}
-  </div>
+  {% include category_menu_top.html %}
   
   {% assign last_meta = site.categories.meta.first %}
   {% if last_meta.active %}