fix: always cache bust index.html

We can always reintroduce Vite PWA once we iron out the
rest of the things and our app is more ready to work offline
(by properly using stores, for example)

The status of workbox support is unclear, once it's clear we can
think about supporting it again: vite-pwa/vite-plugin-pwa#452

frontend/package.json

@@ -88,7 +88,6 @@
     "unplugin-vue-router": "0.5.4",
     "vite": "4.2.1",
     "vite-plugin-pages": "0.29.0",
-    "vite-plugin-pwa": "0.14.7",
     "vite-plugin-vue-layouts": "0.8.0",
     "vue-eslint-parser": "9.1.1",
     "vue-i18n-extract": "2.0.7",

frontend/vite.config.ts

@@ -15,7 +15,6 @@ import {
   Vuetify3Resolver,
   VueUseDirectiveResolver
 } from 'unplugin-vue-components/resolvers';
-import { VitePWA } from 'vite-plugin-pwa';
 import visualizer from 'rollup-plugin-visualizer';
 import VueI18nPlugin from '@intlify/unplugin-vue-i18n/vite';
 import autoprefixer from 'autoprefixer';
@@ -65,7 +64,6 @@ export default defineConfig(({ mode }): UserConfig => {
       Icons({
         compiler: 'vue3'
       }),
-      VitePWA(),
       VueI18nPlugin({
         runtimeOnly: true,
         compositionOnly: true,