Firebase V9 compatibility

[tiffanynk]

import firebase from "firebase/app" threw an error saying:

export 'default' (imported as 'firebase') was not found in 'firebase/app'

Solved by changing imports to:

import firebase from 'firebase/compat/app';
import 'firebase/compat/auth';
import 'firebase/compat/firestore';

[SimCoderYoutube]

The project is running version v8 of firebase, if you want to use v9 you'll have to use compact, I do intend on updating this in the near future.