[docs] Implementation of the api-ref consolidation under doc/source/

If we move the api-ref into doc/source, we should follow the example done by install-guides move: Publish as a single tree to docs.openstack.org and stop publishing to developer.openstack.org. If we want to keep publishing to developer.o.o, let's not move - it gets too complicated, Andreas -- Andreas Jaeger aj@{suse.com,opensuse.org} Twitter: jaegerandi SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126