[Keyboard] Add keyboard Zenith Z-150 (#9811)
* z150 black pill
* z150 docs
* z150: json layout
* Update keyboards/handwired/z150/keymaps/zyxx/keymap.c
Co-authored-by: Joel Challis <git@zvecr.com>
* Update keyboards/handwired/z150/rules.mk
Co-authored-by: Joel Challis <git@zvecr.com>
* Update keyboards/handwired/z150/rules.mk
Co-authored-by: Joel Challis <git@zvecr.com>
* Update keyboards/handwired/z150/z150.c
Co-authored-by: Joel Challis <git@zvecr.com>
* Update keyboards/handwired/z150/config.h
Co-authored-by: Joel Challis <git@zvecr.com>
* Delete bootloader_defs.h
Useless file
* Update keyboards/handwired/z150/readme.md
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Joel Challis <git@zvecr.com>
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