Create codesandbox using the 'parcel' template

The default template is `create-react-app` and this one ignores the `head` tag defined in out `index.html`

examples/resources/common.js

@@ -38,6 +38,9 @@
           },
           "package.json": {
             content: pkgJson
+          },
+          'sandbox.config.json': {
+            content: '{"template": "parcel"}'
           }
         }
       });