[Keymap] Added new custom keymap for the DZ60 (#6948)

[Keymap] Added new custom keymap for the DZ60 (#6948)

* Added custom dz60 keymap

* Update readme.md

* Updated pictures in README.md

* README.md fixes

* Updated mouse layout/ added ` key

* Changed bkspc key to del in mod

* Changed picture

* Updated keymap

* Removed default dz60 config.h

* Updated Readme

* Added Devorak Keymap

* Re-added Default Config File

* Updated Flash Command

* Cleaned Up Custom Config File

* Added Lock Security Layer

* Updated Readme Picture