[Tracking] A working release

[elpiel]

• clean up all the logic from skeleton-solutions for the exercises and update the default skeleton branch
• mdbook & Docs deployment to GH pages - can be found at https://aerorust.org/nanosat-workshop
• test the solutions on the hardware
• book - link to various docs for Application & exercises
• book - Explain the repo structure - skeleton for exercises and skeleton-solutions for the implemented exercises
• 3D frame cad files