The redox book contains some broken links throughout the various
markdown pages. Fix all broken links to existing pages (by using
relative paths only) such that the documentation can be used as
intended.

This reverts merge request !143

The redox book contains some broken links throughout the various
markdown pages. Fix all broken links (to existing pages) such that
the documentation can be used as intended.

Some links are not valid as they are only on GitHub (not part of our
team), other links are not valid as some contributors have not logged
into our GitLab yet

 - Update to latest mdbook
   - Switch to using book.toml
   - No empty links are allowed anymore. Comment out all empty links in
     SUMMARY.md
 - Add theme
   - Add favicon.png

* Fix spelling: github -> GitHub, etc.
* Update the GitHub team list
* Move `null:` and `zero:` to the userspace schemes
* Change icons from Oxygen to Faba/Moka
* Remove statements that TFS is a ZFS implementation
* Add Intel HDA to the supported hardware
* Remove the `libredox` guideline
* Add some outgoing links where I think they're necessary

closes #78

Signed-off-by: Jerome Jutteau <mojo@couak.net>

Ben Elliott authored 8 years ago and Jeremy Soller committed 8 years ago

This contribution adds information for contributors (which fills
in some missing sections in the book). Meta!

I copied a lot of this from the main Redox project's CONTRIBUTING.md,
with minimal changes where appropriate. Also, some small additions.