This reverts commit6da57cbc6e, reversing changes made to62b1843704. Also, adjust new code that was written using the "call handler".
Zed Server
This crate is what we run at https://collab.zed.dev.
It contains our back-end logic for collaboration, to which we connect from the Zed client via a websocket after authenticating via https://zed.dev, which is a separate repo running on Vercel.