Bootstrap the frontend

frontend/src/main.tsx

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+// Copyright 2022 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import React from "react";
+import ReactDOM from "react-dom/client";
+import { RelayEnvironmentProvider } from "react-relay";
+
+import { App } from "./App";
+import RelayEnvironment from "./RelayEnvironment";
+
+ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
+  <React.StrictMode>
+    <RelayEnvironmentProvider environment={RelayEnvironment}>
+      <React.Suspense fallback={"Loading..."}>
+        <App />
+      </React.Suspense>
+    </RelayEnvironmentProvider>
+  </React.StrictMode>
+);