Description:

This the re-organization of the Home Assistant documentation as proposed in #1603.

• The "Getting started" steps are now again in a kind of wizard-style. Extremely minimalist and reduced to fit on a single screen with no scrolling needed to see the whole page.
• New "Docs" section which contains the information previously available in "Getting started"
• Ecosystem, Details, and the advanced topics are now part of "Docs"
• To make the maintenance easier, are now all files divided in a folder per topic in "Docs".
• MQTT splitted like Z-Wave and moved to "Docs"
• and everything else which I already forgot over the 30 commits

Todo:

• Rename section/titles in "Docs" if the name is not accurate enough
• Review the page if the previously used navigation link at the end of the pages is gone
• Check all links Fixing broken links #2217 😞
• Create a better layout of the "Docs" (see Clean up getting started #1603 for navigation examples)

We need to discuss the handling of the HTTP 404 messages. This PR will break almost all links to the documentation. We introduced redirect_from: a while back and could use it. Any thoughts?