Fix broken doi/zenodo link

[freddie-freeloader]

Hey!

I found a broken link in the README and replaced it with the DOI/zenodo link from the badge.

Not sure whether this is the proper replacement -- this PR is mainly about reporting the broken link 😉 .

Kind regards from Berlin,
Jonas

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.02%. Comparing base (6b79d76) to head (c14e124).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
=======================================
  Coverage   72.02%   72.02%           
=======================================
  Files           8        8           
  Lines         579      579           
=======================================
  Hits          417      417           
  Misses        162      162           

Flag	Coverage Δ
unittests	72.02% <ø> (ø)

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[Trybnetic]

Thanks Jonas for spotting and correcting that. Not sure how this (not even existing) DOI ended up there..

Greetings from Tromsø!