add layout 2 and rename existing folder to layout 4

- renamed existing folder with directional layout to layout 4
- udpated existing readme
- Added layout_60_2

keyboards/dz60/keymaps/billiams/build_flash.sh

@@ -1,9 +0,0 @@
-# dfu-programmer atmega32u4 erase --force
-# dfu-programmer atmega32u4 flash /path/to/firmware.hex
-# dfu-programmer atmega32u4 reset
-
-# run this in the qmk_firmware directory
-make dz60:billiams
-dfu-programmer atmega32u4 erase --force && \
-dfu-programmer atmega32u4 flash dz60_billiams.hex && \
-dfu-programmer atmega32u4 reset

keyboards/dz60/keymaps/billiams/config.h

@@ -1 +0,0 @@
-#define GRAVE_ESC_GUI_OVERRIDE    # Always send Escape if GUI is pressed