Change websocket url port 4000 to 4321

.env.example

@@ -24,7 +24,7 @@ REACT_APP_USE_RECAPTCHA=
 REACT_APP_RECAPTCHA_SITE_KEY=
 
 # has to be inserted in the env file to use plugins and other websocket based features.
-REACT_APP_BACKEND_WEBSOCKET_URL=ws://localhost:4000/graphql/
+REACT_APP_BACKEND_WEBSOCKET_URL=ws://localhost:4321/graphql/
 
 # If you want to logs Compiletime and Runtime error , warning and info write YES or if u want to  
 # keep the console clean leave it blank