Implement HTTP/2 and WebSocket support; remove legacy JavaScript and CSS files

- Added HTTP/2 support in src/http2.c and src/http2.h, including session management, frame handling, and response sending.
- Introduced WebSocket functionality in src/websocket.c and src/websocket.h, covering handshake, frame parsing, and message sending.
- Created a WebSocket test page (www/websocket-test.html) for client-side interaction.
- Removed outdated JavaScript (www/script.js) and CSS (www/style.css) files.

server.conf

@@ -2,10 +2,10 @@
 # Lines starting with # are comments
 
 # Server listening port
-port = 8080
+port = 443
 
 # Enable HTTPS (requires valid certificates in certs/ directory)
-use_https = false
+use_https = true
 
 # Log file location
 log_file = log/server.log
@@ -17,7 +17,13 @@ max_threads = 4
 running = true
 
 # Server name or IP address (used for logging and response headers)
-server_name = Your_domain/IP
+server_name = 10.0.0.206
 
 # Enable verbose logging
 verbose = true
+
+# Enable HTTP/2 support (requires HTTPS)
+enable_http2 = true
+
+# Enable WebSocket support
+enable_websocket = false