templates: don't show branch name by default, override in code.html

assets/templates/repo/code.html

@@ -2,6 +2,11 @@
 
 {% block page %}code{% endblock page %}
 
+
+{% block nav %}
+	<a href="/">{{ owner }}</a>/<a href="/">{{ repo }}</a>/<a href="/">{{ branch }}</a>
+{% endblock nav %}
+
 {% block content %}
 <div id=contentWrap>
 	<aside>