[Keyboard] Planck Layout Macro Refactor, Part II (#6156)

* Move layout macros to revision folders

* Update Planck EZ layout macros

Planck EZ only supports one layout (centered 2u spacebar). Deleted all the other macros.

* Flesh out QMK Configurator support

Give each Planck revision its own info.json file.

* Readme updates

- give each revision its own readme
- add the Planck EZ to the main Planck readme

* Fix layout macro for Planck EZ

Previous matrix didn't compile because the electrical matrix defined a k3b location, which was unused by the physical arguments.

Drashna was kind enough to confirm the Planck EZ's matrix for me.

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Pretend the Planck EZ supports ortho_4x12 layout

The hardware doesn't, but doing so prevents CI errors because the default keymap uses LAYOUT_planck_grid.

Going to pretend LAYOUT_ortho_4x12 is a valid layout for the Planck EZ.

* Update Planck EZ's URL in info.json

Co-Authored-By: Drashna Jaelre <drashna@live.com>

keyboards/planck/rev6/info.json

@@ -1,6 +1,6 @@
 {
-  "keyboard_name": "Planck",
-  "keyboard_folder": "planck",
+  "keyboard_name": "Planck rev 6",
+  "keyboard_folder": "planck/rev6",
   "url": "https://olkb.com/planck",
   "maintainer": "jackhumbert",
   "width": 12,