How to run react-firebase-starter in different GCP region

Similar to what is in below sample code would run in `europe-west1`
``` javascript
const functions = require('firebase-functions');

exports.helloWorld = functions
.region('europe-west1')
.https.onRequest((request, response) => {
response.send('Hello from Firebase!');
});
```

Start by reading the sample region configuration in the issue and locating the Firebase Functions entry point in the starter. Determine whether the project needs regional configuration or usage documentation, then verify that the documented or implemented setup runs functions in europe-west1.

Written by the indexing model from the issue text.