feat: warn on interaction with bridged users #74

Fedi accounts using Bridgy Fed to be able to interact with atmosphere accounts require users on Bluesky to also opt-in, but many users won't follow the bot that enables this before interacting with a bridged account. There should be prompts whenever liking, replying, quoting, reposting, or following such an account, to ask if a user wants to follow https://witchsky.app/profile/ap.brid.gy first.