[Keymap] Updates to ortho_4x12/buswerks keymap (#4996)

[Keymap] Updates to ortho_4x12/buswerks keymap (#4996)

* Added buswerks keymap

* cleaned up comments on buswerks keymap

* Added buswerks keymap readme.md

* Fixed spelling in buswerks readme.md

* Removed unnecessary includes, changed process_record_user to now use set_single_persistent_default_layer(), removed deprecated functions, and moved the audio ifdef block to config.h

* Changed buswerks ortho_4x12 layout to accommodate 'MIT' layout

* Updated README.md to reflect layout changes

* update buswerks keymap

* add buswerks tragicforce68 keymap

* add rotary encoder support

* update readme

* fix image link in readme

* fix KC_NO shorthand