[REF] move libs out of playground, add server.py

So we can share it

package.json

@@ -2,6 +2,6 @@
   "name": "owl-playground",
   "description": "Odoo Web Library",
   "scripts": {
-    "start": "python -m SimpleHTTPServer 8001"
+    "start": "python server.py"
   }
 }