Update index.html

Removed dead stun servers.

index.html

@@ -650,18 +650,7 @@
             peer = new Peer({
                 config: {
                     iceServers: [
-                        { urls: 'stun:stun.l.google.com:19302' },
-                        { urls: 'stun:global.stun.twilio.com:3478?transport=udp' },
-                        {
-                            urls: 'turn:numb.viagenie.ca',
-                            username: '[email protected]',
-                            credential: 'muazkh'
-                        },
-                        {
-                            urls: 'turn:turn.bistri.com:80',
-                            username: 'homeo',
-                            credential: 'homeo'
-                        }
+                        { urls: 'stun:stun.l.google.com:19302' }
                     ]
                 },
                 debug: 3 // Enable debug logging