This is a very simple backend that is based in Google Cloud Functions, and it is
only in charge of indexing changes to the collections users, products and
blog to Algolia.
You need to have billing enabled in your Firebase projects to deploy Cloud Functions.
To set this up you just need to create an Algolia account, find your API keys and set the config with:
firebase functions:config:set algolia.app_id="YOUR APPLICATION ID" algolia.api_key="YOUR_ADMIN_KEY --project YOUR_FIREBASE_PROJECT
Then you can deploy with
yarn deploy --project YOUR_FIREBASE_PROJECT