Remove Visible Human Project datasets

[fepegar]

Fixes #1025.

Description
A few sentences describing the changes proposed in this pull request.

Checklist

• I have read the CONTRIBUTING docs and have a developer setup (especially important are pre-commitand pytest)
• Non-breaking change (would not break existing functionality)
• Breaking change (would cause existing functionality to change)
• Tests added or modified to cover the changes
• Integration tests passed locally by running pytest
• In-line docstrings updated
• Documentation updated, tested running make html inside the docs/ folder
• This pull request is ready to be reviewed
• If the PR is ready and there are multiple commits, I have squashed them and force-pushed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.36%. Comparing base (4015824) to head (af13f2c).
Report is 116 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1026      +/-   ##
==========================================
+ Coverage   86.21%   86.36%   +0.14%     
==========================================
  Files          92       91       -1     
  Lines        5810     5771      -39     
==========================================
- Hits         5009     4984      -25     
+ Misses        801      787      -14     

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