* rename LAYOUT to LAYOUT_all
* refactor default keymap
- add license header
- use layer_names enum
- use LAYOUT_all macro
- update keymap to be more generic
- use QMK-native keycode aliases
* info.json: human-friendly formatting
* convert LAYOUT_iso into a proper LAYOUT_60_iso
* LAYOUT_all bugfix
In the physical sense, position k3d is to the left of k3c.
* rework LAYOUT_max into LAYOUT_60_ansi_split_bs_rshift
* remove LAYOUT_iso_splitrshift and iso_split_rshift keymap
* rework LAYOUT_hhkb into LAYOUT_60_hhkb
* amj60.h cleanup
- add license header
- use #pragma once include guard
- concatenate layout block comments
- remove unnecessary function headers
* add license header to amj60.c
* align config.h to QMK template
* align rules.mk to QMK template
* enable Community Layout support
* modernize readme.md
- add PCB image
- convert keyboard data to list
- add flashing and bootloader instructions
- update Docs links
