Add Staryu macropad support (#2768)
* Add M6-A keymap
* Update XD60 keymap
* Update XD60 keymap readme
* Update JJ40 and Let's Split keymaps
* Add readme for M6-A
* Fix typo, update JJ40 README
* Update jj40 readme
* Cleanup jj40 keymap
* Revert Let's Split QWERTY layer to default before #2010
* Update numpad layers
* Fix: Let's Split keymap getting stuck mods due to having keycodes assigned on the Raise layer
* Keep ASCII art consistent with keymap
* Staryu: initial port
* Add personal keymap
* Added and updated READMEs
* Fix: default keymap for staryu
* Rudimentary backlight support.
* Enabled mousekeys for default keymap
* use QMK_KEYBOARD_H and LAYOUT
* Update readme.md for NIU mini: flash using avrdude
* Fix missing linebreaks for Staryu README
* Update readme.md
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