feat: Add /logout route for SLO support

app/scenes/Logout.js

@@ -0,0 +1,12 @@
+// @flow
+import * as React from "react";
+import { Redirect } from "react-router-dom";
+import useStores from "../hooks/useStores";
+
+const Logout = () => {
+  const { auth } = useStores();
+  auth.logout();
+  return <Redirect to="/" />;
+};
+
+export default Logout;