Archive deprecated repositories

[jplatte]

You should probably archive this and other no longer used repositories, so there's a more obvious disclaimer on the page that this repo is no longer used. This makes the repo read-only. Close this issue first if you want there to be 0 open issues again, issues will be read-only too 😄

[nagisa]

Worth noting that this is the repository currently linked from cargo.toml too.

[GuillaumeGomez]

We didn't make a release with the new repository yet, which is why it's still pointing to the old repositories.