[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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