Disabled about page and web upload of plugins.

The about page was not linked from any page, and would expose sensitive
environment variable to admins.

Web upload of plugins was not used and is undesirable for us.

trac-env/conf/trac.ini

@@ -11,6 +11,8 @@ wiki_format_messages = enabled
 
 [components]
 navhider.filter.* = enabled
+trac.about.* = disabled
+trac.admin.web_ui.PluginAdminPanel = disabled
 trac.ticket.query.* = enabled
 trac.ticket.query.querymodule = enabled
 trac.ticket.query.ticketquerymacro = enabled