Accessories cleanup

See merge request !67

Reduce librobotcontrol for now and cleanup each board intro

See merge request docs/docs.beagleboard.io!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