AMJ40 Refactor (#11854)
* update keyboard source files
- add license headers (attributed to original keyboard submitter)
- #pragma once include guards
- file template matching
- readme update and template matching
* set sensible default keyboard settings
- enable Bootmagic Lite and Mouse Keys
- disable Console and Command
- remove default keymap's rules.mk file
* remove unnecessary files from default keymap
* refactor default keymap
* add additional layouts/keymaps
* update keyboard readme
- add images and bootloader instructions
- reformat link list
* convert tabs to spaces in default keymap
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