If you want to install Bibliogram on a computer at home (e.g. a Raspberry Pi) and then access it from another network, you will need to set up port forwarding.
80(for http) and
443(for https, if you are using https) to your home server.
The way to do this depends on your specific router. You will need to read the documentation of your router on how to do that. Router manufacturers often use different terminology. Common names are "Port forwarding" or "Virtual Server".
Searching online for the brand/model of your router (e.g.
d-link port forwarding) should help.