Devops/release notes

[dennisbader]

Checklist before merging this PR:

• Mentioned all issues that this PR fixes or addresses.
• Summarized the updates of this PR under Summary.
• Added an entry under Unreleased in the Changelog.

Summary

• adds release notes to documentation
• adds release body for github releases linking to the release notes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.01%. Comparing base (db570e6) to head (2d1cd87).
Report is 1 commits behind head on master.

❗ Current head 2d1cd87 differs from pull request most recent head d66325d. Consider uploading reports for the commit d66325d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2333      +/-   ##
==========================================
- Coverage   94.02%   94.01%   -0.02%     
==========================================
  Files         138      138              
  Lines       14201    14187      -14     
==========================================
- Hits        13353    13338      -15     
- Misses        848      849       +1     

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