add link to the categories in the index page
diff --git a/templates/index.html b/templates/index.html
index c378d3b..d1e3e89 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -3,7 +3,7 @@
 <header>
   <h3>
     {% block header %}
-    Index &#124; <a href="{{ SITEURL }}/archives.html">Archives</a>
+    Index &#124; <a href="{{ SITEURL }}/archives.html">Archives</a> &#124; <a href="{{ SITEURL }}/categories.html">Categories</a>
     {% endblock header %}
   </h3>
 </header>