开启 fingerprint 时，PWA 缓存文件 失效

[Lruihao]

References:

https://github.com/reuixiy/hugo-theme-meme/blob/master/assets/js/sw.js

1. https://developers.google.com/web/fundamentals/primers/service-workers
2. https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook
3. https://googlechrome.github.io/samples/service-worker/
4. https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers
5. https://serviceworke.rs/
6. https://www.youtube.com/watch?v=baSiSIyTGSk

[Lruihao]

另外：未开启 footer 时，fixit.min.svg 打包时不会保留，缓存文件应当去除缓存 fixit.min.svg

[Lruihao]

该问题尚未解决，建议 fingerprint 和 PWA 功能不要同时开启！