docs: Add CITATION.cff file and update vCHEP DOI

[matthewfeickert]

Resolves #492

• Add CITATION.cff for the software and the vCHEP paper.
• Update vCHEP paper to use published DOI.
  • c.f. https://doi.org/10.1051/epjconf/202125103067

$ pixi global install cffconvert
$ cffconvert --validate --infile CITATION.cff
Citation metadata are valid according to schema version 1.2.0.

[matthewfeickert]

@alexander-held to preview this if you open the GitHub repo on the PR branch then you'll get the "Cite this repository" button.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (866406b) to head (ae21db9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #494   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         2094      2094           
  Branches       347       347           
=========================================
  Hits          2094      2094           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[matthewfeickert]

Ping @alexander-held for review.

[matthewfeickert]

Ping @alexander-held (though I know you're finishing up some ATLAS physics stuff and so quite busy 👍)

[matthewfeickert]

👋 Ping on this @alexander-held

[MoAly98]

I think this can be merged. @alexander-held you ok with that?

@matthewfeickert I am not seeing a merge button, not sure if Alex needs to approve first or it's because branch is out-of-date with master.

[alexander-held]

Looks all good to me as well, thanks!

* Add CITATION.cff for the software and the vCHEP paper.
* Update vCHEP paper to use published DOI.
   - c.f. https://doi.org/10.1051/epjconf/202125103067