Publish OPS Guide to /openstack-ops

This depends on https://review.openstack.org/101993:
Publish OPS Guide to /openstack-ops and not anymore to
/trunk/openstack-ops.

Add redirects as needed and change all links.

Change-Id: Ib52bbbb1ec6e90ad3222ea6685039fd4d3fb366d
Merge "Publish OPS Guide to /openstack-ops"