Update beaglebone black files

Closes #3

See merge request docs/docs.beagleboard.io!7

support clean-up

See merge request !6

Speed up build and start working on support

See merge request docs/docs.beagleboard.io!5

small fixes

See merge request docs/docs.beagleboard.io!4

suggest not using unnecessary abbreviations

See merge request docs/docs.beagleboard.io!3

Main

See merge request docs/docs.beagleboard.io!2

Fixed header color on mobile view.

New sphinx documentation setup for BeagleBoard docs wesbite.