feat(shields) Add Redox Shield Support (#1002)

* Add redox shield support

* typo

* Pull request fixes

* requested changes

add underglow, add copyright, remove display

* remove because of no display

* comment fix

* bt clear

app/boards/shields/redox/redox.zmk.yml

@@ -0,0 +1,12 @@
+file_format: "1"
+id: redox
+name: Redox
+type: shield
+url: https://github.com/mattdibi/redox-keyboard
+requires: [pro_micro]
+features:
+  - keys
+  - underglow
+siblings:
+  - redox_left
+  - redox_right