Some minor refactoring of boards in 1upkeyboards directory (#5236)

Some minor refactoring of boards in 1upkeyboards directory (#5236)

* use #pragma once

* get rid of code for unused indicators

* pragma once and other small fixes for consistency

* use #pragma once

* pragma once and other small fixes for consistency

* add a short blurb to the readme

* turn on compiler optimization flags

* remove the compiler optimization

* remove compiler optimization for super16