Back to vanilla ZMK! Yay!
To get rid of the remaining few custom dependencies I am making a few
additional small changes:
- Drop generic usage page keycodes for now (they didn't work on
bluetooth for me)
- Stop using display tweaks for Corneish Zen (at this point my display
is almost dead anyhow & I can just disable the widgets alltogether)
- Refactor repo to move Zephyr to the top-level
- Overload zephyr directly from the parent west manifest to get
child-node fix
- Use custom justfile recipe to get `west test` running
