Bump openstackdocstheme to 1.30.0
Bump openstackdocstheme to 1.30.0

...to pick up many improvements, including the return of table borders.

Change-Id: Ib56557bfaf634d12c4d4960811ad24a4152a864e

stackforge/puppet-ceph,openstack/puppet-ceph,openstack/puppet-ceph