[api] added instagram as backup for getting userID

[yssf-io]

This should help with AWS blocking. We basically first use the Threads URL, and then the IG if that fails.

It looks like IG is more difficult from AWS, but Threads works, and if Threads profiles go down (like last time), we have a backup with IG.

But I think we should still be looking at other ways to get the userID.

PS: it works on my EC2 but still spotty