[Scenario Bundle] Make "Publication" sub-item of "Study details"

[u-mueller]

Description of the issue

A user test showed that information about the publication is seen as natural part of information about the study and should be located there.

Ideas of solution

Make "Publication" sub-item of "Study details".

Workflow checklist

• [ ] I am aware of the workflow in CONTRIBUTING.md

[stap-m]

This issue has not yet been solved, but the current structure looks different now.

I think, if we want to aggregate some of the menu topics, I'd rather join "study details" and "basic information" instead. The two are about the content of the study, whereas publication is not.

I will transfer this issue to oeplatform.