Update setup.md

[chennesy]

Describe source of data and license. Fixes #166 and addresses Carpentries Lab Review.

[github-actions]

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🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-python-intro/compare/md-outputs..md-outputs-PR-172

The following changes were observed in the rendered markdown documents:

 md5sum.txt | 2 +-
 setup.md   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2026-08-12 23:06:56 +0000