Exclude other files contained in the user_docs folder (#16047)
Related #15945, #16024
Summary of the issue:
The documentation folder in the NVDA directory contains files that the user does not need.
For example: keyCommandsDoc.py
Description of user facing changes
The structure of the subfolders in documentation is the same as in the release version, with documentation/styles.css removed.
Description of development approach
In setup.py, exclude the corresponding file
