feat: enable PWA

via vite-plugin-pwa for simple configuration

package.json

@@ -57,6 +57,7 @@
     "tslib": "^2.4.1",
     "typescript": "^5.0.0",
     "vite": "^4.2.0",
+    "vite-plugin-pwa": "^0.19.8",
     "vitest": "^1.2.2"
   },
   "type": "module",

vite.config.ts

@@ -1,6 +1,7 @@
 import { sveltekit } from '@sveltejs/kit/vite'
 import { defineConfig } from 'vite'
+import { VitePWA } from 'vite-plugin-pwa'
 
 export default defineConfig({
-  plugins: [sveltekit()],
+  plugins: [sveltekit(), VitePWA()],
 })