Addkeymap/satan fakb (#2833)

Addkeymap/satan fakb (#2833)

* edited keymap and fitted for tada68

* edited rules to make mouse work

* filled config.h to make mouse cursor move smooth

* added descriptive readme

* added layout with split backspace and steamlined naming

* added layout with split shift, split backspace and split #

* changed keymap to fit the new layout

* removed duplicate layout KEYMAP_FAKB and pointed keymap.c to default on

* further cleanup from layout duplicate