Update docs more frequently

[twifkak]

trafficstars

The release process introduced in #169 mean that all our changes to .md file aren't visible until a packager release. Either:

1. Move all the docs to wiki.
2. Regularly merge changes in .md files from master to releases.
3. Keep .md files only on the release branch.

I'm partial to the first. The other two seem like they might cause git consternation.

[twifkak]

Probably some hybrid approach. Minimal amount of docs in README.md, that don't need to be updated frequently, and outlink to wiki for as much as possible.