Orange75: cleanup and Configurator support update (#4101)

Orange75: cleanup and Configurator support update (#4101)

* Orange75: cleanup and Configurator support update

`orange75.h`:
Moved `K014` to the second (number row) as the left half of a split Backspace (guessing at its true location; will need to be checked/tested after merge).

`info.json`:
Updated to match new `LAYOUT` macro.

`keymaps/default/keymap.c`:
- Updated to match new `LAYOUT` macro.
- Added layer mock-ups as block comments.
- Formatted to be a bit more readable.

* Orange75: deleted an extra comma from keymap.c