🎁 Wish: Collection filters should include the local instance in "Trusted Instances"

[We](https://do.basspistol.org) run a small Gancio instance with very little activity. While we raise awareness for it, we're happy for it to be a node aggregating events from more active instances. It's a winwin: cool instances get more contact surface, ours doesn't look empty. The collections are a powerful tool, we use two: "Music" and "Activism" allowing us to filter events relevant to our community (mainly music) on the landing page and have a separate collection for events beyond that scope. Sadly, there is no way to add our own instance to the "trusted instances" filter. Meaning, if someone creates an event on our instance, that matches our community criteria, but isn't music related, we need to add another tag the existing collection in order for it to be displayed at all. It would be wonderful if the local instance was available for selection in the "Trusted Instances" list. I hope this makes sense and am happy to elaborate if not. Either way, thank you very much for this amazing piece of software!