Since openstack-manuals, api-guide, api-ref, and openstack-tox-docs are
now publishing via promote jobs, the publish jobs are not needed
anymore, remove them and the playbooks they used.
Note that publish-openstack-tox-docs is used in a few places, update one
here (requirements) and mark the job as deprecated. Before this one can
be removed, update all users.
Remove the now unused afsdeveloper_secret as well.
Depends-On: https://review.opendev.org/677009
Change-Id: Id8069557d0cf788e6eb469c8141945f89ac462e6
33b31e5775