* Ensure there is a single source of collection metadata
* Allow collection subdirs to be detected by a galaxy.yml or MANIFEST.json
* Add documentation about installing and downloading collection directories
* Add an example for downloading a git repository
* Update documented valid metadata sources for installing git repositories
Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>
Co-authored-by: Alicia Cozine <879121+acozine@users.noreply.github.com>
##### SUMMARY
Previously folder tree example for collection adjacent to the current playbook were displaying a subfolder below the playbook instead of being a sibling.
