[Upstream training] Publish Upstream on docs.openstack.org/upstream-training
[Upstream training] Publish Upstream on docs.openstack.org/upstream-training

Upstream training is currently published as draft. Enable publishing as a
regular content on docs.openstack.org/upstream-training.

Change-Id: I9efa7918d84acd7d637f063b3ef8b07291072c15

openstack/training-guides,openstack/training-guides