* add matrix_diagram.md
* refactor default keymap
- use four-space indent
- grid-align keycodes
- use QMK-native keycode alias for `RGB_MODE_RGBTEST`
* refactor default_iso keymap
- use four-space indent
- grid-align keycodes
* refactor via keymap
- use four-space indent
- grid-align keycodes
- use QMK-native keycode alias for `KC_TRNS`
* info.json: apply friendly formatting
* add maintainer and url keys to info.json
* add LAYOUT_ansi with reference keymap
* add LAYOUT_iso; refactor default_iso keymap
* standardize default and via keymaps
- use `QK_GESC` at top left
- use `KC_DEL` for right half of Split Backspace
- use `KC_NUHS` for Non-US Hash position
- use `KC_NUBS` for Non-Us Backslash position
- use `KC_RGUI` for middle right mod
* add RGB Underglow keycodes to all keymap Function layers
* Clean up `DEBOUNCE` in config.h, 0-9
* Clean up `DEBOUNCE` in config.h, A
* Clean up `DEBOUNCE` in config.h, B
* Clean up `DEBOUNCE` in config.h, C
* Clean up `DEBOUNCE` in config.h, D
* Clean up `DEBOUNCE` in config.h, E
* Clean up `DEBOUNCE` in config.h, F
* Clean up `DEBOUNCE` in config.h, G
* Clean up `DEBOUNCE` in config.h, H
* Clean up `DEBOUNCE` in config.h, handwired
* Clean up `DEBOUNCE` in config.h, I
* Clean up `DEBOUNCE` in config.h, J
* Clean up `DEBOUNCE` in config.h, K
* Clean up `DEBOUNCE` in config.h, L
* Clean up `DEBOUNCE` in config.h, M
* Clean up `DEBOUNCE` in config.h, N
* Clean up `DEBOUNCE` in config.h, O
* Clean up `DEBOUNCE` in config.h, P
* Clean up `DEBOUNCE` in config.h, Q
* Clean up `DEBOUNCE` in config.h, R
* Clean up `DEBOUNCE` in config.h, S
* Clean up `DEBOUNCE` in config.h, T
* Clean up `DEBOUNCE` in config.h, U
* Clean up `DEBOUNCE` in config.h, V
* Clean up `DEBOUNCE` in config.h, W
* Clean up `DEBOUNCE` in config.h, X
* Clean up `DEBOUNCE` in config.h, Y
* Clean up `DEBOUNCE` in config.h, Z
* Remove default debounce from info.json
* Migrate non-default debounce to info.json
