Add multi-purpose search

templates/categories.html

@@ -9,11 +9,11 @@ vim: ts=2 noexpandtab
 	<ul>
 		{% for category in categories %}
 		<li>
-			{{ category }}
+			<a href="search?c={{ category }}">{{ category }}</a>
 			<ul>
 			{% for sub_category in categories[category] %}
 				<li>
-				{{ sub_category }}
+				<a href="search?s={{ sub_category }}">{{ sub_category }}</a>
 				</li>
 			{% endfor %}
 			</ul>