fix(base): Use Build Time Base Path

* If a base path is provided at build time, use it.
  * Base path can be set with `VIKUNJA_FRONTEND_BASE` at
    build time
    * `VIKUNJA_FRONTEND_BASE` sets `import.meta.env.BASE_URL` after Vite resolves it.
    * Usages of `import.meta.env.BASE_URL` are statically replaced
      at build time.
    * If base path is not provided, `import.meta.env.BASE_URL`
      defaults to '/'.
    * Documentation:
      https://vitejs.dev/guide/env-and-mode.html

* Fixes:
  * Manifest not loading because of incorrect path.
  * Service Worker not loading because path is incorrect in
    manifest.
  * Service Worker crashing because import of workbox is from
    wrong path.
  * Service Worker not loading a task because path is incorrect
    in event listener.
  * Incorrect URLs being set on window because base path is
    incorrect.
    * ex: `/login` vs `/base/login`

Signed-off-by: Jef Oliver <jef@eljef.me>

src/router/index.ts

@@ -81,7 +81,7 @@ const EditTeamComponent = () => import('@/views/teams/EditTeam.vue')
 const NewTeamComponent = () =>  import('@/views/teams/NewTeam.vue')
 
 const router = createRouter({
-	history: createWebHistory(),
+	history: createWebHistory(import.meta.env.BASE_URL),
 	scrollBehavior(to, from, savedPosition) {
 		// If the user is using their forward/backward keys to navigate, we want to restore the scroll view
 		if (savedPosition) {