Nobody maintains our askbot website, and questions there go
unanswered. In the spirit of simplification, make the site
read-only (so that old answers can still be found) and redirect
users to the openstack-discuss mailing-list and Stack Overflow
(which has a decent openstack community answering questions).
Read-only config values documented at:
https://github.com/ASKBOT/askbot-devel/blob/master/askbot/conf/access_control.py
Change-Id: I33d9d7c87a5a17138fcdc37ee8f8b16cda2248d5