tbkmini-col2row-zmk: ZMK for TBKmini and Skeletyl

PCB:

• This Firmware assumes that you use this PCB https://github.com/Bastardkb/Dactyl-Manuform-PCB-Plate
• (NOT this one: https://github.com/Bastardkb/Skeletyl-PCB-plate)

Pins

• This firmware assumes that you wired your PCB to your nice!nano in the following way:

PCB Pin | MCU Pin
R2      | 4
R3      | 5
R4      | 6
R6      | 7

PCB Pin | MCU Pin
C1      | 19 (only used for TBKmini, not for Skeletyl)
C2      | 18
C3      | 15
C4      | 14
C5      | 16
C6      | 10

Thumb PCB Pins
C2, C4, C5, R6

image from https://zmk.dev/docs/development/boards-shields-keymaps