Revive FlutterFire documentation at: https://firebase.flutter.dev/

[qwadrox]

I propose a revival and update of the previously archived FlutterFire official documentation.

The current documentation suggests the CLI as the primary method for configuring new Flutter applications. However, the flutterfire_cli tool falls short in fulfilling this task effectively.

Over the past 13 months, there have been no significant updates to the CLI. Although the prerelease version 0.3.0-dev.18 addresses some edge cases, it still seems far from being production-ready, in my opinion. Presently, setting up a Flutter app using this approach requires manual intervention and additional research, which indicates that the process is not as straightforward as it could be.