Add JOSS paper citation and code

[NicolaCourtier]

Description

Update the citation file, add a link to the JOSS paper and the code used to generate it.

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #).

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: $ pre-commit run or $ nox -s pre-commit (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: nox -s tests
• The documentation builds: nox -s doctest
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.15%. Comparing base (4628a65) to head (86b18b8).
⚠️ Report is 41 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #851      +/-   ##
===========================================
+ Coverage    89.41%   90.15%   +0.73%     
===========================================
  Files           63       63              
  Lines         4857     4917      +60     
===========================================
+ Hits          4343     4433      +90     
+ Misses         514      484      -30     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[BradyPlanden]

Looks great - thanks @NicolaCourtier!