[BUG] Link in docs to open in Colab does not work

[albertvillanova]

Describe the bug
Link in docs to open in Colab does not work, even after adding the notebook_folder arg to Build docs, done in PR:

• Pass notebook_folder to build notebook docs #671

Related issues:

• [BUG] Guided Tour does not open in Colab #647
• Jupyter Notebooks for Documentation #211
• Fix broken Colab and Sagemaker notebook links #113

Code to reproduce the error
Click "Open in Colab" link.

Error logs (if any)

Notebook not found

There was an error loading this notebook. Ensure that the file is accessible and try again.
https://github.com/huggingface/notebooks/blob/main/smolagents_doc/en/secure_code_execution.ipynb

In the GH Action to build the docs, it appears the message: https://github.com/huggingface/smolagents/actions/runs/13374673277/job/37351097439

Notebooks creation was not enabled.

[albertvillanova]

CC: @mishig25 for visibility.