Remove Changelog view in the about menu, add documentation link to the about template

apps/common/urls.py

@@ -4,7 +4,6 @@ from django.conf import settings
 
 urlpatterns = patterns('common.views',
     url(r'^about/$', direct_to_template, {'template': 'about.html'}, 'about_view'),
-    url(r'^changelog/$', 'changelog_view', (), 'changelog_view'),
     url(r'^license/$', 'license_view', (), 'license_view'),
     url(r'^password/change/done/$', 'password_change_done', (), name='password_change_done'),
     url(r'^object/multiple/action/$', 'multi_object_action_view', (), name='multi_object_action_view'),