Fix/minor issues

[deveaud-m]

This PR addresses three minor topics:

• proper versioning of the documentation using the semantic release workflow
• extension of the testing guidelines for contributors
• rewriting of relevant tests using one single reference file to avoid the flaky action behavior

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.48%. Comparing base (ba2676f) to head (d0511ee).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #190       +/-   ##
===========================================
- Coverage   91.93%   81.48%   -10.46%     
===========================================
  Files          15       15               
  Lines        1811     1836       +25     
===========================================
- Hits         1665     1496      -169     
- Misses        146      340      +194     

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