Remove images present in fig folder that are not references in curriculum content

[marcodallavecchia]

This PR closes #360, by removing unreferences images that were version controlled in the fig directory but never used in the actual markdown text.

As briefly listed in #350, I could only find those 3 images that were not used, thus I simply removed them. Re-rendering the website locally did not lead to any errors.

It should be straight-forward to merge this, as I only removed the unused images.

[github-actions]

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⏱️ Updated at 2026-03-23 15:52:50 +0000