Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/221

It can be enable in the Rocket.toml config or using ROCKET_FEDERATION_ENABLED=true

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/211

They are not in the spec and maubot relies on that

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/182


Reviewed-by: Timo Kösters <timo@koesters.xyz>

The 404 error for /profile in the spec says "There is no profile
information for this user or this user does not exist.", but Element
assumes every 404 is a user that does not exist.