Support closing the webapp after authentication

[Livshitz]

Only when getting into the webapp from the extension, and not independently from app.saveeai.com.

You should probably pass an argument from the extension when opening the webapp:
https://github.com/feedox/fact-base/blob/master/packages/web/src/resources/chrome-extension/content.js#L86

Should be integrated here:
https://github.com/feedox/savee/blob/master/packages/web/src/views/misc/login.vue#L183

Can use this command:
window.close();