Trim down README.
README: Add instructions on how to build documentation
Add requirements/docs.txt for just documentation dependencies
Add link to RTD at top of README.
Remove unncessary comma
Updated bundled cytoscape.js version in ganetiviz, to 2.0.4 (latest)
Refs #15657
Merge branch 'pramttl-enhancement/15657' into develop

* pramttl-enhancement/15657:
  Updated bundled cytoscape.js version in ganetiviz, to 2.0.4 (latest) Refs #15657
Merge branch 'bug/15195' into develop

* bug/15195:
  Remove unncessary comma
  Add link to RTD at top of README.
  Add requirements/docs.txt for just documentation dependencies
  README: Add instructions on how to build documentation
  Trim down README.
Update documentation

Remove empty files.

Re-arrange doc structure.

Fix references.
Merge branch 'enhancement/13785_squashed' into develop

* enhancement/13785_squashed:
  Update documentation
Add release process docs

refs #16089
Add release doc to index

refs #16089
Merge branch 'enhancement/16089' into develop

* enhancement/16089:
  Add release doc to index
  Add release process docs
requirements: Update django_object_log version.
Vagrant: Update Berksfile.lock to use latest version of cookbook
Add migration in ganeti_web to resolve schema changes.

Add migration for moving of custom field to new django app
Merge branch 'bug/16143' into develop

* bug/16143:
  Add migration in ganeti_web to resolve schema changes.
template_to_instance: Fix attribute errors.

Adds a hypervisor field to the template model, and corrects the misuse of the
start field as well.

refs #16149
check_quota_modify: Fix key error

refs #16149
Update Vagrant and Chef environment for GWM