mdBook 0.4.30 with FA 6.2.0 support

Update to mdBook 0.4.30

mdBook FontAwesome 6.2.0 support

Adds support for FontAwesome 6.2.0.

On Windows, use the attached mdbook-fa6.exe file. On Ubuntu, use the attached mdbook-fa6 file instead.

mdBook FA5 support

Support for FontAwesome 5.
This is mostly just a place to grab the latest binary because compiling this binary manually is a pain.