[Keymap] Underglow support for Launchpad (#5340)

[Keymap] Underglow support for Launchpad (#5340)

* added my launchpad

* updated keymap with legends and fixed layout errors

* Added default keymap with added layer for RGB controls and included the necessary config code

* fixed layer orders

* removed my personal keymap to clean PR

* missed an underscore

* updated readme

* removed more unnecessary code

* moved RGB code to its own config phone

* moved underglow info to its own readme

* removed redundant code from default_rgb config.h file, included QMK KEYBOARD H in place of initial defines in keymap.c

* reverted launchpad config

* removing the = because I can't figure out why its there

* Revert "removing the = because I can't figure out why its there"

This reverts commit e3b5e6d568e7225635844ba617aaef4f77727ce6.

* reverted rev1/config.h

* reverted all files I should not have touched

* removing redundant code in rules.mk

* readibility improvements to keymap