Allow forwarding the base domain to a different web service

[perzarys]

It would be great if instead of the base-domain.tld auto-redirecting to base-domain.tld/login, one could adapt the redirection so that it redirects to other-domain.tld. Like that the login page would not always be exposed, and I could host another website at the base domain describing my service. Maybe that's already possible, but I couldn't figure it out myself with the nginx config. Any hints are appreciated!