Drewkeys Mercury65 Layout Additions (#21924)
* Rename `LAYOUT` to `LAYOUT_all`
[refactor]
* Add layout/matrix diagram
[docs]
* Correct `LAYOUT_all` data
Correct the order of the Up arrow and End keys.
[enhancement]
* Tidy-up `info.json` formatting
- add line breaks between physical rows
- remove trailing spaces
[style]
* Add `LAYOUT_iso_blocker_split_bs`
[enhancement]
* Add `LAYOUT_iso_blocker_tsangan_split_bs`
[enhancement]
* Add `LAYOUT_ansi_blocker_split_bs`
[enhancement]
* Add `LAYOUT_ansi_blocker_tsangan_split_bs`
[enhancement]
91e0e46e4a