Update reference to opening science book

[tmillenaar]

Hey all,

This PR addresses #168

The existing link did not work for me until I went through the newly proposed link first. From there you can either view the book in dynamic form as it was linked to before or use another link to get a pdf. This has been described in the issue linked here above.

Kind regards,
Timo

[github-actions]

Thank you!

Thank you for your pull request 😃

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-git/compare/md-outputs..md-outputs-PR-186

The following changes were observed in the rendered markdown documents:

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

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⏱️ Updated at 2025-08-07 12:33:42 +0000

[alex-ball]

@tmillenaar, thank you very much for taking the time to find the most suitable replacement link to this book. Much appreciated!