Babylon Scene Manager Update

Babylon scene manager extension clean up

Playground/index.html

@@ -56,9 +56,6 @@
              >
         </script>
 
-        <!-- Unity Toolkit Scene Manager -->
-        <script src="https://raw.githubusercontent.com/MackeyK24/MackeyK24.github.io/master/toolkit/babylon.manager.js" ></script>
-
         <style>
             html,
             body,