Remove old redirects from .htaccess
Remove old redirects from .htaccess

The file collected redirects since the beginning of the repo, let's
remove all those that have been there for over a year or point to
documents that are currently are reorganized.

Change-Id: I445f4276a08b1818aab817e1189e03a892d97656

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals