Add Satellite Documentation

This is working towards documentation of individual satellites, the collection thereof and publication on the website

What this needs to do still:

• Glob all README.md from cxx and py satellites
• Copy them into the docs/satellites folder, changing the same to sth like cxx_satllites_prorotype.md
• Amend their file name in the toctree list of docs/satellites/index.md

Optional things include:

• Make some nice rendering out of the header block by defining a sphinx template for it
• Define the standardized fields we want in there

This closes #81 (closed)