[converter/a1200] Changing layout macro reference info.json (#14143)

* Rename keyboards/converter/a1200/config.h to keyboards/converter/a1200/teensy2pp/config.h

* Rename keyboards/converter/a1200/rules.mk to keyboards/converter/a1200/teensy2pp/rules.mk

* Create dummy

* Add files via upload

* Delete dummy

* Update readme.md

* Update info.json

keyboards/converter/a1200/info.json

@@ -4,7 +4,7 @@
     "width": 22.5, 
     "height": 6.5, 
     "layouts": {
-        "LAYOUT_default": {
+        "LAYOUT": {
             "layout": [
             {"label":"Esc", "x":0, "y":0}, 
             {"label":"F1", "x":2, "y":0},