Update server-setup-and-configuration.md

[jonashrem]

As requested, I extended the server setup and configuration part.

@DavidLambauer please check out, this is what you had in mind.

We can also go more into details about how to configure each service exactly, but in this case, we should create a subpage for each service.

[DavidLambauer]

Thank you @jonashrem ! 🥳 LGTM

For additional content like a guide for setting up varnish or nginx properly, I would add a new file under Tutorials & Examples.