Reduce librobotcontrol for now and cleanup each board intro
- Restore AI-64 chapter 6, which needs a lot of work
- Changes to most boards index page
- Import some changes off of Deepak's tree (Fire export details)
- Fix Fire forum link in another place
- Fix Fire OSHWA certification ID
- Enable Graphviz
- Fail build on PDF build failure
- Reduce items in ToC
- Try to clean up some of introduction material
- Starting on Linux article based on Tops-Down presentation I started back in 2011 or so
- Clean up some split between BeagleConnect boards and BeagleConnect technology (still has branding issues)