Use Jenkins templates for old manual jobs

Create templates for the old (Grizzly/Folsom only) guides.

Merge all manual templates in projects.yaml under one entry.

Also, publish atom.xml to docs.o.o as only xml file.
Related patch https://review.openstack.org/#/c/47897/

Partial-Bug: #1228604

Change-Id: Id0ccaedc910eecd175b9fb7bd965a10e2371ae08
Merge "Use Jenkins templates for old manual jobs"