PWA caching CDN pointing to d33wubrfki0l68.cloudfront.net

Probably not a great idea to have a direct link to `d33wubrfki0l68.cloudfront.net` in `nuxt.config.ts` - might be best to point to lib docs showing how to setup or having it unset by default? [https://pwa.nuxtjs.org/workbox](https://pwa.nuxtjs.org/workbox)