[Keymap] Add keymap for keebio/nyquist (#6144)

[Keymap] Add keymap for keebio/nyquist (#6144)

* duplicate default

* delete colemak, dvorak

* cleanup

* update keymap

* disable unused rules, fix spit leds

* ascii layout keymap

* wip change rgb on layer

* change rgb on layer

* change rgb on caps lock

* add impl navigation layer

* add readme, swap gui and alt

* update readme

* Update keyboards/keebio/nyquist/keymaps/georgepetri/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
* Update keyboards/keebio/nyquist/keymaps/georgepetri/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
* remove backslashes, use IS_HOST_LED_ON