Puck Refactor, Configurator support and readme cleanup (#4615)

* Puck: layout macro refactor

Reformat layout macro to resemble physical keyboard layout.

* Puck: Configurator support

* Puck: readme cleanup

Markdown formatting corrections.

keyboards/puck/info.json

@@ -0,0 +1,25 @@
+{
+  "keyboard_name": "Puck", 
+  "url": "", 
+  "maintainer": "john-pettigrew", 
+  "width": 3, 
+  "height": 4, 
+  "layouts": {
+    "LAYOUT": {
+      "layout": [
+        {"label":"SW1", "x":0, "y":0}, 
+        {"label":"SW2", "x":1, "y":0}, 
+        {"label":"SW3", "x":2, "y":0}, 
+        {"label":"SW4", "x":0, "y":1}, 
+        {"label":"SW5", "x":1, "y":1}, 
+        {"label":"SW6", "x":2, "y":1}, 
+        {"label":"SW7", "x":0, "y":2}, 
+        {"label":"SW8", "x":1, "y":2}, 
+        {"label":"SW9", "x":2, "y":2}, 
+        {"label":"SW10", "x":0, "y":3}, 
+        {"label":"SW11", "x":1, "y":3}, 
+        {"label":"SW12", "x":2, "y":3}
+      ]
+    }
+  }
+}