[Keyboard] Split GMMK Pro PCBs into separate revisions (#13570)

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

keyboards/gmmk/pro/ansi/keymaps/jonavin/readme.md

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+# jonavin's GMMK Pro layout
+
+- Add all the non-RGB related keys from Glorious Core default mapping that's missing in the default qmk mapping
+- Add PrtScr, Scroll Lock, Break, NumLock to Fn layer
+- Implement Win key lock using Fn+Win like in Glorious Core firmware
+- Layer 2 mod on Caps Lock with double-tap to switch to this layer, double tap to switch back
+- Layer 2 provides arrows on WASD and additional nav keys + right hand numpad with 00; an be used for Alt Code entry
+- Layer 2 left spacebar Backspace
+- add double tap of Left Shift to toggle Caps Lock
+- additional encoder functionality
+    - holding L shift, Navigate page up/down
+    - holding Left Ctrl, navigate prev/next word
+    - holding Left Alt, change media prev/next track
+    - default is change volume
+
+## All layers diagram
+Default layer
+![image](https://user-images.githubusercontent.com/71780717/124177658-82324880-da7e-11eb-9421-b69100131062.png)
+
+Fn Layer
+![image](https://user-images.githubusercontent.com/71780717/124176887-8742c800-da7d-11eb-9b19-156bd67cac7d.png)
+
+Layer 2 (Caps Lock Mod)
+![image](https://user-images.githubusercontent.com/71780717/124177683-8b231a00-da7e-11eb-9434-e2475f679a54.png)