Dmitry Tantsur 3faf13bbb4 Refactor and fix documentation
Currently the index page contains a brief introduction and 3 links.
Expand the table of contents to show more subheadings.

Clean up the install, admin and contributing docs of unnecessary
and wrong content and redundant headings.

Update URLs throughout the text.

Change-Id: I03279ffc9faf387b08f727dee3b8898a69918460
2020-08-24 15:27:45 +02:00
..
2020-08-24 15:27:45 +02:00