link tags to their tag index

omicron/ssg/templates/plain/article.html

@@ -17,7 +17,7 @@
         {% if article.tags %}
         <ul>
             {% for tag in article.tags | sort %}
-            <li>{{ tag }}</li>
+            <li><a href="{{ site.base_dir }}tags/{{ tag }}/">{{ tag }}</a></li>
             {% endfor %}
         </ul>
         {% endif %}