Convert item.cg files into item.json

data/extra_utilities/items/compressed_cobblestone/item.json

@@ -0,0 +1,3 @@
+{
+    "description": "Compressed Cobblestone is a way to both store more cobblestone in less space, and to create a harder and more sturdy form of cobblestone.  It can even be compressed into more and more compressed versions."
+}