[ refactor ]: redirect to auth on server side for quicker UX

[Kiryous]

[benharri]

i fixed it in mine with this commit https://github.com/bluesky-social/feed-generator/commit/adabfbb7a339a24414b2f8a9e979593f930a6b93

[mackuba]

I had one more thought about this while adding this feature to my code now - I think it would be good to keep it optional and not on by default in development mode, only turn it on when deployed in production.

In development on a local machine, it will be normal to have the script running for some time and then not running when the developer is not working on it. So if they turn it on e.g. in the morning and kill the script and then restart it again in the evening, they would suddenly get a whole day's worth of events to process…