Delete old Peer implementation and adapt previous code paths

This still doesn't compile but should be close.

server/src/auth.rs

@@ -137,34 +137,6 @@ impl PeerExt for Peer {
     }
 }
 
-#[async_trait]
-impl PeerExt for zrpc::peer2::Peer {
-    async fn sign_out(
-        self: &Arc<Self>,
-        connection_id: zrpc::ConnectionId,
-        state: &AppState,
-    ) -> tide::Result<()> {
-        self.disconnect(connection_id).await;
-        let worktree_ids = state.rpc.write().await.remove_connection(connection_id);
-        for worktree_id in worktree_ids {
-            let state = state.rpc.read().await;
-            if let Some(worktree) = state.worktrees.get(&worktree_id) {
-                rpc::broadcast(connection_id, worktree.connection_ids(), |conn_id| {
-                    self.send(
-                        conn_id,
-                        proto::RemovePeer {
-                            worktree_id,
-                            peer_id: connection_id.0,
-                        },
-                    )
-                })
-                .await?;
-            }
-        }
-        Ok(())
-    }
-}
-
 pub fn build_client(client_id: &str, client_secret: &str) -> Client {
     Client::new(
         ClientId::new(client_id.to_string()),