Fix links in readme

[jackgerrits]

Closes #4818

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.20%. Comparing base (bac6dc5) to head (d41b4c1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4881      +/-   ##
==========================================
- Coverage   68.21%   68.20%   -0.02%     
==========================================
  Files         158      158              
  Lines        9960     9960              
==========================================
- Hits         6794     6793       -1     
- Misses       3166     3167       +1     

Flag	Coverage Δ
unittests	68.20% <ø> (-0.02%)	⬇️

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