* Hardware update
Backlight enable
Change pin
Add 2keys (68→70)
* change readme
* support rev1
change keymap path
* move ergodash.h
* sync the left and right backlight led
matrix.c is same as iris keyboad
backlight breathing is unstable, so it comment out
* Update default Nyquist revision
* LED slave fix
* Sync changes from lets_split
* Add needed check for debouncing
* Remove line that was setting PD2 pin and interfering with use of that pin
* Add backlight key to keymap
The let's split code used delays in its debouncing algorithm which
increases input latency. This commit copies and adapts the code from
`quantum/matrix.c` to lets_split's `matrix.c`.