publishing docs
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Added branch policy documentation
First approach at a proper overview in the docs

Added a stub for editing basics doc that is focused on non-technical audiences.
Added to the 'how to contribute' to explain how to set up local environment for testing documentation changes.
A wholesale restructuring of the documentation.

The existing content (some of which will have to be reworked to fit better) is
now in the following main sections:

* Getting started (introduction): step-by-step tutorials and guides to
  get you up and running
* How-to guides (how_to): guides covering more advanced development
* Key topics (topics): explanations of key parts of the system
* Reference (reference): technical reference for APIs, key models and
  so on
* Development & community (contributing)
* Using django CMS (user): guides for using rather than setting up or
  developing for the CMS
* Release notes & upgrade information (upgrade)
fix for https://github.com/divio/django-cms/issues/3563
Merge pull request #3565 from Medvezhopok/support/3.0.x

fix for https://github.com/divio/django-cms/issues/3563
Merged django CMS tutorial into docs.

Merged the django CMS tutorial from
https://github.com/divio/django-cms-tutorial. The tutorial was originally
created by Kim Thoenen https://github.com/chive/.
Restructuring of how_to and topic sections
Synchronise docs restructure with support/3.0.x
More work on restructuring
Merge remote-tracking branch 'origin/technical-board' into support/3.0.x
Merge pull request #3567 from evildmp/support/3.0.x

Merge technical board documents
Merge branch 'support/3.0.x' into docs-restructure2
More documentation moves to appropriate sections

* a lot of material has been moved from /topics to /reference and
  /how_to
* redundant sections (particularly navigation placeholders) removed
* /user section removed from index for now
Merge remote-tracking branch 'upstream/support/3.0.x' into contributing-docs

Conflicts:
	docs/contributing/index.rst
Update release notes for 3.0.6
Fix typo
Merge pull request #3569 from evildmp/update_release_notes

Update release notes
Merge pull request #3568 from evildmp/publishing

Amendments to publishing documentation