Add DOI badge to credits section

[epassaro]

📝 Description

Type: 📝 documentation | 🎢 infrastructure

Added the specific DOI badge to the Credits section of the documentation, and consequently in README.rst.

📌 Resources

🚦 Testing

How did you test these changes?

• Testing pipeline
• Other method (describe)
• My changes can't be tested (explain why)

Can't be tested on CI because this change will be triggered only at post-release stage. But you can test it locally by running python ./ci-helpers/update_credits.py and then cd docs && DISABLE_NBSPHINX=1 make html. Should look like this:

☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

Note: If you are not allowed to perform any of these actions, ping (@) a contributor.

[codecov]

Codecov Report

Merging #2045 (3bcf78a) into master (2b220af) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2045   +/-   ##
=======================================
  Coverage   59.87%   59.87%           
=======================================
  Files          70       70           
  Lines        8157     8157           
=======================================
  Hits         4884     4884           
  Misses       3273     3273           

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