Draft: HIFIS for... scientists

I have no clue why this MR is regarded as merged now 😠

• 👉 Review here
• 👉 Edit here

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• Input very first content e8e2daa6
  • Add a bit more missing content on VC/compute/sci tools, CI, tutorials @jandt-desy
  • Fix Poster subclip 2 (letters missing)
• Go through this page thoroughly in VC 2022-03-23
• Finalize until 2022-03-28

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Closes #243 (closed)