Keymap: Fixed poor layout of EP40 default keymap (#4330)

Keymap: Fixed poor layout of EP40 default keymap (#4330)

* add initial ep40 files

* fixed issues

* updated keymap

* Added media control

* Update keyboards/handwired/ep40/rules.mk

Co-Authored-By: e11i0t23 <32494740+e11i0t23@users.noreply.github.com>
* Fixed requested changes

* Fixed more requested changes

* Added delete key to layor 1

* Updated defualt keympap to have a Backspace mod del key

* removed place holder

Co-Authored-By: e11i0t23 <32494740+e11i0t23@users.noreply.github.com>
* removed obsolete code

Co-Authored-By: e11i0t23 <32494740+e11i0t23@users.noreply.github.com>