add fed.brid.gy to the list

Add [fed.brid.gy](https://fediverse.observer/fed.brid.gy) to the list so that posts bridged from bluesky are supported. For example: https://fed.brid.gy/r/https://bsky.app/profile/did:plc:z72i7hdynmk6r22z27h6tvur/post/3lqv2pprabs2i