Move see also blocks to bottom of each page to include reading docs, remove 'fork me' to avoid text overlap,
simply menu nav so folks find the chapter link.

Updating docs, added extensive info on playbook async + external vars_files for keeping variables outside of
the playbook file.

interesting docs pages, some misc editing here and there.

https://github.com/ryan-roemer/sphinx-bootstrap-theme

Fix some rst related formatting.