AMJ60 Refactor (#13530)

* 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

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