Include community peripherals and patches

[Jookia]

This includes:

• The LimeSDR board https://github.com/myriadrf/Novena-RF
• MadHacker's iCE40 FPGA board https://www.jamiecraig.com/novena-ice40-add-on/
• The novena guide at https://github.com/bnewbold/novena-guide

[Jookia]

Going through forks and PRs of xobs' branch seems like a good idea too