Refactor scenes into separate files

index.html

@@ -92,7 +92,11 @@
         </div>
 
         <script src="https://unpkg.com/matter-js@0.19.0/build/matter.min.js"></script>
-        <script src="./scenes.js"></script>
+        <script src="./scenes/scene-grid.js"></script>
+        <script src="./scenes/scene-balanced.js"></script>
+        <script src="./scenes/scene-lowg.js"></script>
+        <script src="./scenes/scene-fastdrop.js"></script>
+        <script src="./scenes/index.js"></script>
         <script src="./ui.js"></script>
         <script src="./main.js"></script>
     </body>