Add configurations for service worker

frontend/src/routes/+layout.svelte

@@ -1,7 +1,7 @@
 <script>
-	import { pwaInfo } from 'virtual:pwa-info'; 
+//  import { pwaInfo } from 'virtual:pwa-info'; 
 	import BottomAppBar from '$lib/components/BottomAppBar.svelte';
-	$: webManifestLink = pwaInfo ? pwaInfo.webManifest.linkTag : '' 
+//	$: webManifestLink = pwaInfo ? pwaInfo.webManifest.linkTag : '' 
 </script> 
 
 <slot></slot>
@@ -9,9 +9,11 @@
 	<BottomAppBar />
 </footer>
 
+<!--
 <svelte:head> 
    {@html webManifestLink} 
 </svelte:head>
+-->
 
 <style>
 	footer {

frontend/vite.config.ts

@@ -1,15 +1,9 @@
 import { sveltekit } from "@sveltejs/kit/vite";
 import adapter from "@sveltejs/adapter-node";
-import { SvelteKitPWA } from '@vite-pwa/sveltekit'
 
 const config = {
   plugins: [
     sveltekit(), 
-    SvelteKitPWA({
-      strategies: 'injectManifest',
-      srcDir: 'src',
-      filename: 'sw.ts',
-    })
   ],
   test: {
     include: ["src/**/*.{test,spec}.{js,ts}"],