Broken/wrong link

[gilly7]

In the introduction. the link to "firebase for flutter" is broken and can't be found.

[ditman]

Thanks for reporting! I'm carving some time to address a bunch of issues with this codelab (using an older version of flutterfire, some links breaking, etc...)

In the meantime, try this one by @domesticmouse, it's newer and should be more up to date with what Flutter and Firebase are now!
https://firebase.google.com/codelabs/firebase-get-to-know-flutter#0