Add optional donation/contribution link in-app
What is the problem you are facing?
Funkwhale is a free software project run by donations and volunteers, so ensuring that anybody who wishes to contribute has the opportunity to do so is important. Adding an optional link to the contribution page somewhere in the application would be a good way of increasing visibility while users listen.
What are the possible drawbacks or issues with the requested changes?
This needs to be entirely optional in the settings menu so that hosters can turn it off and on at will, and possibly even include their own donation links somewhere down the line.