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: I872c975b45253700b801eb201f7cdbde9bc00762

openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca,openstack/puppet-monasca