Welcome to the ODK Forum, @Kaka-v_Kaka! If you have a moment, introduce yourself here!
That nginx error means that you're trying to run two web servers on the same port.
I think you'd need to fork one of the repos, and modify the docker-compose file to run on a separate port.
E.g. ODK Central exposes 80 and 443: https://github.com/getodk/central/blob/master/nginx.dockerfile#L10
No guarantees this will work straight away, but worth a try!
I'm skirting around the "same port" issue by running ODK Central (and many more apps, many of them exposing standard ports like 80, 443, 8080) on Kubernetes, orchestrated through Rancher. Write-up: Installing ODK central in microsoft azure cloud - #2 by Florian_May