* Adds Audio Keycodes to both the feature page and master list
* Re-orders the keycode list, so it's alphabetical (mostly)
* Add additional (missing) sections to the keycode list
* Add and update links in the keycode page
* Add and reorder links in sidebar's keycode section
* Add Faux Clicky to main Audio feature
* Make clicky settings user configurable
* Add additional documentation
* Don't play when music mode is enabled (hopefully)
* Skip process_music in NO_MUSIC_MODE is defined
* Skip matrix_scan_music if NO_MUSIC_MODE is defined
* Skip music_all_notes_off if NO_MUSIC_MODE is defined
* Leave matrix_scan_music in, because it reduces firmware size by 150b....
* Add docs for NO_MUSIC_MODE
