Convert OpenMS tutorial pdf handout to markdown

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https://abibuilder.informatik.uni-tuebingen.de/archive/openms/Tutorials/Handout/master/handout.pdf

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https://github.com/OpenMS/Tutorials/tree/master/Handout (images)

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https://towardsdev.com/3-ways-to-add-a-caption-to-an-image-using-markdown-f2ca30562be6

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https://www.markdownguide.org/extended-syntax/#footnotes

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https://abibuilder.informatik.uni-tuebingen.de/archive/openms/Tutorials/Handout/master/output/handout-clean.html