Remove a few TODOs, either solved or converted to issue

src/server/command.rs

@@ -47,7 +47,6 @@ pub async fn handle_command(
 }
 
 async fn socket_activate(config: ServerConfig) -> anyhow::Result<()> {
-    // TODO: allow getting socket path from other socket activation sources
     let conn = get_socket_from_systemd().await?;
     let uid = conn.peer_cred()?.uid();
     let unix_user = UnixUser::from_uid(uid)?;