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/6column.dtsi

@@ -0,0 +1,19 @@
+#include <layouts/foostan/corne/6column.dtsi>
+#include <physical_layouts.dtsi>
+
+#include "position_map.dtsi"
+
+&layouts_foostan_corne_position_map {
+    status = "disabled";
+};
+
+&layouts_joric_jorne_position_map {
+    joric_jorne_6col_posmap: six {
+        physical-layout = <&foostan_corne_6col_layout>;
+        positions
+            = <42  0  1  2  3  4  5        6  7  8  9 10 11 43>
+            , <   12 13 14 15 16 17       18 19 20 21 22 23   >
+            , <   24 25 26 27 28 29       30 31 32 33 34 35   >
+            , <               36 37 38 39 40 41               >;
+    };
+};