[Keymap] Adds Egstad Preonic Profile (#6837)

[Keymap] Adds Egstad Preonic Profile  (#6837)

* setup local build config, created npm build script to speed things up

* removed some profiles and gutted readme

* began configuring default and lower layout

* lower: fixed right arrow and added music toggle

* began configuring default and lower layout

* changed startup song

* updated comment typos

* I did that thing where i basically refactored everything :)

* Converted 2U key to 1U's

* Reorganized and tidied up

* Reorganized and tidied up

* space now changes layers

* updated numbpad

* updated readme

* removed unwanted files

* addressed change requests