remove node holders and general repo cleanup

the node holders were just causing issues, we have no need for them currently, so we can just set the secure proxy URL through FORWARD_DESTINATION. less complexity for the cluster and self-hosters too

prudpv1/src/prudp/socket.rs

@@ -360,8 +360,6 @@ impl<T: CryptoHandler> InternalSocket<T> {
     async fn connection_thread(
         connection: Weak<InternalConnectionMutex<T::CryptoConnectionInstance>>,
     ) {
-        //todo: handle stuff like resending packets if they arent acknowledged in here
-
         while let Some(conn) = connection.upgrade() {
             let mut conn = conn.lock().await;