All the data is store in Firestore database.
Let's get started. Create an account in Firebase with your google account.
( You may use existing firebase db )
Create Firebase Project.
Then go in Project settings, and click on "Add Firebase to your web app"
Then copy the config string.
Now in the config.js file you will find another config object. Copy the config from firebase and enter it there.
Now continue with Step 3.