Have main and listSystems working

frontend/public/index.html

@@ -24,6 +24,10 @@
       work correctly both with client-side routing and a non-root public URL.
       Learn how to configure a non-root public URL by running `npm run build`.
     -->
+		<script src="%REACT_APP_BACKEND_SERVER%/socket.io/socket.io.js"></script>
+		<script>
+		  const socket = io('%REACT_APP_BACKEND_SERVER%');
+		</script>
     <title>React Redux App</title>
   </head>
   <body>