[Keymap] Added HHKB Keymap and user config (#8119)
* Added my config
* Update my keymap
* Improve quality of brett.c
* Finish cleaning brett.c
* Remove QMK_FIRMWARE_H
* Update keyboards/hhkb/keymaps/brett/keymap.c
Co-Authored-By: Ryan <fauxpark@gmail.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
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