Accessories cleanup

See merge request !67

Reduce librobotcontrol for now and cleanup each board intro

See merge request !69

Update License Terms grid

See merge request !68

Still need to do a deep dive on Displays.

Changes include:
* Fixing broken links and removing products no longer available/relevant
* Changed links to point to US version of websites
* Added details for new boards including BeagleV
* Fixed some board names, spelling, etc.

Gateware design overview and version retrieval

See merge request beaglev-fire/docs!1

Add BeagleV-Fire and librobotcontrol

See merge request !66