Implement 'Cite' for datasets

[egonw]

Implements #2325

Description

Adds the Cite button to the dataset aspect.

Caveats

Please list anything which has been left out of this PR or which should be considered before this PR is accepted
Check any of the following which apply:

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

If you make changes to the Python code

• My code passes the tox check, I can receive warnings about tests, documentation or both

Testing

• https://scholia.toolforge.org/dataset/Q120320769
• https://scholia.toolforge.org/dataset/Q120320769/export

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)

[fnielsen]

The curation link disappears <a id='curation-link' role="button" class="btn btn-outline-secondary d-none">Improve data</a I think it is the page_actions` that does that.

[larsgw]

Oops, I missed that. Yes, I think it needs a {{ super() }} before endblock, that's what the work template has.

[egonw]

I'm on it.