Import assets and add PWA.

src/main.tsx

@@ -2,5 +2,19 @@ import { render } from "preact";
 import "./styles/index.scss";
 import { App } from "./app";
 
+import { registerSW } from 'virtual:pwa-register'
+
+const updateSW = registerSW({
+    onNeedRefresh() {
+        // ! FIXME: temp
+        updateSW(true);
+        // show a prompt to user
+    },
+    onOfflineReady() {
+        console.info('Ready to work offline.');
+        // show a ready to work offline to user
+    },
+})
+
 // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
 render(<App />, document.getElementById("app")!);