Redesign biome and update

- Updates to 1.21.3
- Biome changes with correct colours

data/herohost/dimension/world.json

@@ -4,11 +4,9 @@
         "type": "minecraft:flat",
         "settings": {
             "biome": "herohost:biome",
-            "lakes": false,
-            "features": false,
             "layers": [{
-                "height": 1,
-                "block": "minecraft:air"
+                "block": "minecraft:air",
+                "height": 1
             }],
             "structure_overrides": []
         }