[Keyboard] Dumbo (#9656)

* added dumbo keyboard

* added my personal keymap

* changed picture in readme

* removed rev1 folder to reduce clutter and confusion

* missed a few changes in last commit, everything should be added now

* Apply suggestions from code review

Committed all of the suggested changes except for removing the bootloader reference comments in rules.mk as i think it is handy.

* Update keyboards/dumbo/rules.mk

Removed the bootloader reference as suggested

* Apply clean up of info.json

* Apply suggestions from noroadsleft to support community layout LAYOUT_SPLIT_3x6_4 in the future_4

keyboards/dumbo/info.json

@@ -0,0 +1,64 @@
+{
+    "keyboard_name": "Dumbo",
+    "url": "",
+    "maintainer": "adamnaldal",
+    "width": 15.5,
+    "height": 5.25,
+    "layouts": {
+        "LAYOUT_split_3x6_4": {
+            "layout": [
+                {"x":0, "y":1.25},
+                {"x":1, "y":1},
+                {"x":2, "y":0.25},
+                {"x":3, "y":0},
+                {"x":4, "y":0.5},
+                {"x":5, "y":0.75},
+
+                {"x":9.5, "y":0.75},
+                {"x":10.5, "y":0.5},
+                {"x":11.5, "y":0},
+                {"x":12.5, "y":0.25},
+                {"x":13.5, "y":1},
+                {"x":14.5, "y":1.25},
+
+                {"x":0, "y":2.25},
+                {"x":1, "y":2},
+                {"x":2, "y":1.25},
+                {"x":3, "y":1},
+                {"x":4, "y":1.5},
+                {"x":5, "y":1.75},
+
+                {"x":9.5, "y":1.75},
+                {"x":10.5, "y":1.5},
+                {"x":11.5, "y":1},
+                {"x":12.5, "y":1.25},
+                {"x":13.5, "y":2},
+                {"x":14.5, "y":2.25},
+
+                {"x":0, "y":3.25},
+                {"x":1, "y":3},
+                {"x":2, "y":2.25},
+                {"x":3, "y":2},
+                {"x":4, "y":2.5},
+                {"x":5, "y":2.75},
+
+                {"x":9.5, "y":2.75},
+                {"x":10.5, "y":2.5},
+                {"x":11.5, "y":2},
+                {"x":12.5, "y":2.25},
+                {"x":13.5, "y":3},
+                {"x":14.5, "y":3.25},
+
+                {"x":3.25, "y":3.75},
+                {"x":4.25, "y":3.75, "h":1.5},
+                {"x":5.25, "y":3.75, "h":1.5},
+                {"x":6.25, "y":4.25},
+
+                {"x":8.25, "y":4.25},
+                {"x":9.25, "y":3.75, "h":1.5},
+                {"x":10.25, "y":3.75, "h":1.5},
+                {"x":11.25, "y":3.75}
+            ]
+        }
+    }
+}