changed fdroid with cleanapk to check app existance
Description
App lounge replace gplay apps of search page with open source ones if they exist in the fdroid. Previously this existance was checked with fdroid url (https://f-droid.org/fr/packages/{packageName}). Now it's checked with cleanapk endpoint to maintain the consistancy as app lounge uses cleanapk to manage open source apps, doesn't use fdroid apis.