Transfer Documentation to Github Wiki

[a2800276]

Move existing documenation into github wiki to allow more collaborative work on it. Some issues to consider:

• can we have "releases", i.e. different documentation versions that correspond to different version of the firmware? The wiki is backed by git, it may be possible to have different branches ...
• can we export the documentation, i.e. to pdf?

[a2800276]

This (https://chrome.google.com/webstore/detail/docs-to-markdown/igffnbdfnodiaphfmfaiiaegmoljbghf) looks promising for an initial import.