Update Docs and generated files with `--project=appalias`

[KostasDimakis]

Looks like there might be a neat way to avoid accidental deployment to the wrong target with the use of --project=appalias.

More info: https://firebase.google.com/docs/cli#use_aliases

[simondotm]

Now Documented here: https://github.com/simondotm/nx-firebase/blob/main/docs/nx-firebase-projects.md#binding-nx-projects-to-firebase-projects