Fix packaging issue where included files were installed in wrong location

[ariebovenberg]

Description

Before merge

• tox runs successfully
• Docs updated

Before release (if applicable)

• Version updated in pyproject.toml
• Version updated in pre-commit hook example
• Version updated in changelog
• Branch merged
• Tag created and pushed
• Published
• Github release created

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4f22d56) 100.00% compared to head (31fdcd7) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #218   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          502       502           
  Branches       104       104           
=========================================
  Hits           502       502           

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