first draft technical board/code of conduct
typo, minor changes
Added list of retired core developers
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
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 remote-tracking branch 'upstream/support/3.0.x' into contributing-docs

Conflicts:
	docs/contributing/index.rst