reduce the lsit of versions

Playground/js/config_versions.js

@@ -1,6 +1,5 @@
 CONFIG_last_versions = [
     ["Latest","https://preview.babylonjs.com/babylon.js"],
     ["4.0.3","https://unpkg.com/babylonjs@4.0.3/babylon.js"],
-    ["4.0.0","https://unpkg.com/babylonjs@4.0.0/babylon.js"],
     ["3.3","https://unpkg.com/babylonjs@3.3.0/babylon.js"]
 ];