replace detector resolution example (#769)

Joachim Wuttkerequested to merge
j.769re into main

Sharp diffraction pattern and exaggerated resolution function to show a clear effect.

Non-quadratic detector and anisotropic resolution to make test sensitive for bugs in index handling.

This resolves #769 (closed).

Follow-up issues:

  • #772 (closed) revise ad-hoc repair of DiffUtil::meanRelVecDiff; investigate tiny numbers in examples/scatter2d/Resolution
  • #773 (closed) update hugo

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