Support userscript

[SunRunAway]

For safari & firefox, because we do not have the extension, we can support build a userscript JS file for tampermonkey(https://www.tampermonkey.net) and userscript(https://apps.apple.com/cn/app/userscripts/id1463298887?l=en&mt=12)

[gregwebs]

It should be able to work in all browsers. The issue is documented in #25. There might be the same issue in the user script: I think the issue is during the auth flow, which would still be needed with a userscript.