Improve forum style and templates

forum/templates/forum/main.jinja

@@ -2,20 +2,6 @@
 {% from 'core/macros.jinja' import user_profile_link %}
 {% from 'forum/macros.jinja' import display_forum %}
 
-{% block head %}
-{{ super() }}
-<style type="text/css" media="all">
-.forum {
-    background: lightblue;
-    padding: 2px;
-    margin: 2px;
-}
-.category {
-    background: skyblue;
-}
-</style>
-{% endblock %}
-
 {% block content %}
     <p>
     <a href="{{ url('forum:main') }}">Forum</a> >