[Keyboard] Refactor S60x (#5596)

[Keyboard] Refactor S60x (#5596)

* remove files that contributed to default hex file creation

* fix up rgb pcb rules and config that previously depended on rules and config in a parent directory

* use #pragma once

* turn on backlight breathing and use #pragma once

* fix config.h and rules.mk to not depend on the parent directory

* use #pragma once

* removed keyboard info.jsons in favor of a shared one

* add in hhkb layout and shared info.json file

* fixup readme file

* remove cruft

* use bootmagic lite over yes

* fix config path and use pragma once

* commit PR fixes

* update manufacturer

* set bootloader correctly