404: Not Found Error

[jonilynn02]

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Describe the bug
404: Not Found error when viewing dataset notebook

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://developer.ibm.com/exchanges/data/all/bias-in-advertising/'
2. Click on 'View dataset notebooks'
3. See error

Expected behavior
Ability to view dataset notebook

Screenshots

Desktop (please complete the following information):

• OS: Windows 11 Home
• Browser: Microsoft Edge
• Version 128.0.2739.79

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[johentsch]

I'm having the same problem. This link here points to a project presentation on some archival Git branch:
https://nbviewer.jupyter.org/github/DCMLab/schubert_dances/blob/ada-project/DataStory.ipynb
It has been working for many years. Now it yields 404. The problem also shows when I head to https://nbviewer.org/ and enter the (still functional) URL of the notebook: https://github.com/DCMLab/schubert_dances/blob/ada-project/DataStory.ipynb