Update Molly entry, remove/discourage Molly-FOSS

Yeah, still working.

“If you have either Molly or Molly-FOSS installed, just update like usual. No migration needed. ”

Fosstodon – 27 Dec 25

Molly (@mollyim@fosstodon.org)

Starting with v7.68.5-1, we've unified Molly and Molly-FOSS into a single fully FOSS app, with no proprietary dependencies. We replaced the proprietary Play Services SDK previously used by Molly with our own open-source implementation, so FCM push...