docs: remove outdated WebSockets section and update file upload example

Author: elcharitas

sites/docs/versioned_docs/version-0.5.x/advanced-features.md

@@ -333,55 +333,6 @@ async fn main() {
 }
 ```
 
-## WebSockets
-
-Ngyn supports WebSockets for real-time communication:
-
-```rust
-use ngyn::prelude::*;
-use futures::{SinkExt, StreamExt};
-use tokio::sync::broadcast;
-
-#[handler]
-async fn websocket_handler(ws: WebSocket) -> Result<(), String> {
-    // Accept the WebSocket connection
-    let (mut sender, mut receiver) = ws.accept().await.map_err(|e| e.to_string())?;
-
-    // Create a channel for broadcasting messages
-    let (tx, _rx) = broadcast::channel::<String>(100);
-    let tx2 = tx.clone();
-
-    // Spawn a task to handle incoming messages
-    tokio::spawn(async move {
-        while let Some(Ok(message)) = receiver.next().await {
-            if let Ok(text) = message.to_text() {
-                println!("Received message: {}", text);
-                let _ = tx.send(text.to_string());
-            }
-        }
-    });
-
-    // Spawn a task to send messages to this client
-    tokio::spawn(async move {
-        let mut rx = tx2.subscribe();
-        while let Ok(message) = rx.recv().await {
-            let _ = sender.send(ngyn::ws::Message::text(message)).await;
-        }
-    });
-
-    Ok(())
-}
-
-#[tokio::main]
-async fn main() {
-    let mut app = HyperApplication::default();
-
-    app.get("/ws", websocket_handler);
-
-    let _ = app.listen("127.0.0.1:3000").await;
-}
-```
-
 ## File Uploads
 
 Ngyn supports file uploads using multipart form data:
@@ -392,8 +343,10 @@ use futures::TryStreamExt;
 use std::io::Write;
 
 #[handler]
-async fn upload_handler(multipart: Multipart) -> Result<JsonResult, String> {
+async fn upload_handler(body: Body) -> Result<JsonResult, String> {
     let mut uploaded_files = Vec::new();
+    let multipart = body.to_multipart()
+       .map_err(|e| e.to_string())?;
 
     let mut multipart = multipart.into_inner();
 
@@ -429,8 +382,4 @@ async fn main() {
 }
 ```
 
-## Conclusion
-
-These advanced features allow you to build complex, production-ready applications with Ngyn. By leveraging dependency injection, middleware, gates, and integrations with databases and other services, you can create robust and maintainable web applications.
-
 For more examples and detailed documentation, check out the [Ngyn repository](https://github.com/ngyn-rs/ngyn).