[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>

1 files changed, 13 insertions, 0 deletions

diff --git a/keyboards/planck/rev3/readme.md b/keyboards/planck/rev3/readme.md
new file mode 100644
index 000000000..26ef89831
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+++ b/keyboards/planck/rev3/readme.md
@@ -0,0 +1,13 @@
+# Planck
+
+A compact 40% (12x4) ortholinear keyboard kit made and sold by OLKB and Massdrop. [More info on qmk.fm](http://qmk.fm/planck/)
+
+Keyboard Maintainer: [Jack Humbert](https://github.com/jackhumbert)  
+Hardware Supported: Planck PCB rev3  
+Hardware Availability: [OLKB.com](https://olkb.com), [Massdrop](https://www.massdrop.com/buy/planck-mechanical-keyboard?mode=guest_open)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make planck/rev3:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).