feat(shields): add physical layouts and update keymap for Jorne

Add physical layouts and update the keymap for Joric's Jorne.
Layouts are added for all three possible transforms:
- Full (with additional pinky key)
- 6 column (Corne), re-uses Corne layout
- 5 column (Minidox), re-uses Corne layout

Keymap update includes quick-tap-ms (essential for this keymap), small
guide clarifications, output selection, tri-layer and &studio_unlock.

app/boards/shields/jorne/layouts/position_map.dtsi

@@ -0,0 +1,7 @@
+/ {
+    layouts_joric_jorne_position_map: layouts_joric_jorne_position_map {
+        compatible = "zmk,physical-layout-position-map";
+
+        complete;
+    };
+};