Support "remembering" a session on a browser

[clokep]

django-otp can plug into django-agent-trust with django-otp-agents, maybe there's nothing else to do here besides documenting that.

[dwasyl]

+1 Documenting how to do this would be great. It doesn't seem like the biggest challenge, but the documentation on it is pretty light.

[9mido]

Updating the link since the original one no longer works and adding a few more:

https://django-otp-official.readthedocs.io/en/stable/auth.html#authorizing-users

https://github.com/django-otp/django-agent-trust

https://github.com/django-otp/django-otp-agents