Publish on F-Droid

[arm32x]

Since this app is open-source, it would be great if it could be published on F-Droid.

[IzzySoft]

In its current state it would not be accepted I'm afraid, see here. Show stoppers are:

Offending libs:
---------------
* BillingClient (/com/android/billingclient): NonFreeDep,NonFreeNet
* Crashlytics (/com/crashlytics): Tracking
* Firebase Data Transport (/com/google/android/datatransport): NonFreeNet
* Google Mobile Services (/com/google/android/gms): NonFreeDep
* Firebase (/com/google/firebase): NonFreeNet,NonFreeDep
* Firebase Analytics (/com/google/firebase/analytics): Tracking

6 offenders.

F-Droid would need a build flavor where those dependencies are removed.