Update/cleanup documentation
This closes #26 (closed), by better explaining which base project you should use for various purposes. I also took the opportunity to clean up the docs a bit in a few more ways:
- Made the README a bit more clear
- I don't instinctively click on a shield, so I added a link to the documentation
- Hid the Easter egg a bit more carefully, before it was the first link that said "documentation".. I get the joke, I don't like to read, but seeing it for a 5th time doesn't make me like reading any more.
- Deleted the sections that all just linked to the software docs.
- Fixed a bug where the "edit" links on the docs pages were giving a 404.
- Add more links to mattermost and AtlasTalk in the introduction.
- Renamed
index.md->introduction.md,usage.md->basic_usage.md,athena.md->advanced_usage.md - Add a section in development on how to check out Athena packages and edit them.
- Deleted the
miscellaneous.mdsection. Who is going to read that anyway? I moved the only content there into the installation: people should check to check the output from tests as a starting point.