fix: links to benchmarks in README.md

[robertodr]

Summary

what it says on the tin.

Checklist

• Tests added or updated to cover the changes
• Documentation updated (docstrings, docs/, CONTRIBUTING.md) if needed
• CHANGELOG / release notes updated if applicable

AI/LLM disclosure

• I did not use LLM tooling, or used it only privately for ideation
• I used the following tool to help write this PR description:
• I used the following tool to generate or modify code:

Important

By opening this PR I confirm that I have read CONTRIBUTING.md and I agree to the terms of the Contributor License Agreement.

Warning

If you're contributing on behalf of your employer, contact cla@algorithmiq.fi to arrange a Corporate CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.70%. Comparing base (3ca8c4e) to head (a492cd7).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   87.56%   87.70%   +0.14%     
==========================================
  Files          59       59              
  Lines        4239     4239              
  Branches     1497     1497              
==========================================
+ Hits         3712     3718       +6     
  Misses        163      163              
+ Partials      364      358       -6     

Flag	Coverage Δ
cpp	86.19% <ø> (+0.16%)	⬆️
python	95.31% <ø> (ø)

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[github-actions]

Docs preview: https://pr-178.monoprop-docs.pages.dev

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud