[Keymap] Add users/alfrdmalr and switch to layouts (#8030)

* WIP do not merge

* first pass at custom preonic layout

* add auto shift and reset via leader key

* Update readme

* update copyright notice

* formatting changes

* fix: use MO instead of process_record_user

* added backslash and moved grave position

* remove extraneous 'j' characer in NUMPAD template

* update template formatting

* remove process_record_user

* swap "!" with "@"

* fix readme formatting

* update readme layout image

* restore settings layer

* add windows minimize sequence

* fix: switch to correct seq function for three-key sequence

* fix: missing semicolon

* refactor: move keymap to userspace and generic 5x12 layout

* add numlock to numpad layer

* add readme

* update readme formatting

* remove unused wrappers from layout keymap

* update readme title to reflect new location

* remove alfrdmalr directory from preonic/keymaps

* clean up user config

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