feat: pwa manifest file and service worker

src/index.js

@@ -2,11 +2,11 @@
 import ReactDOM from "react-dom/client";
 import { Toaster } from "react-hot-toast";
 import { Reset } from "styled-reset";
-
 import { DndProvider } from "react-dnd";
 import { HTML5Backend } from "react-dnd-html5-backend";
 import "./assets/vars.css";
 import "animate.css";
+import * as serviceWorkerRegistration from "./serviceWorkerRegistration";
 import MarkdownStyleOverride from "./common/component/MarkdownStyleOverride";
 import ReduxRoutes from "./routes";
 const root = ReactDOM.createRoot(document.getElementById("root"));
@@ -20,3 +20,4 @@ root.render(
     <MarkdownStyleOverride />
   </>
 );
+serviceWorkerRegistration.register();