Consider removing the donation link in the UI and adding a warning about Lemmy

The creators of Lemmy are tankies and have some pretty despicable views, maybe we shouldn't advertise giving them money.

I like the software, it feels cozy outside some communities from lemmy.ml, and I hope someone forks it eventually, but for now removing the link should be easy to do.

Relevant thread: https://mstdn.social/@feditips/106835057054633379