add redirect for /releases to the new location
add redirect for /releases to the new location

The content under docs.o.o/releases is moving to releases.o.o instead,
so set up a redirect.

Depends-On: I547f1c3731e86353c3338035c65e5b887d9deee5
(changing the publishing instructions)

Depends-On: I41221d84e6c985bcc55f9b2a6f15210d2410bc84
(establishing the new vhost)

Change-Id: I8435bb6ea7250cf41c803278784d3ccedf487834

AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals