Regenerate `clean/` folder + Fix notebook validation errors caused by extra fields

[gunchu]

Regenerating before making change to one of the notebooks.

Surprisingly (or because of my lack of knowledge of how to use nbdev/execnb libs) current read_nb() function adds these unexpected keys to notebook JSON:

1. idx_ to all the cells
2. path_ to the root

These result in errors of the following type when notebook is opened:

Notebook validation failed: Additional properties are not allowed ('idx_' was unexpected):

To address this issue, the proc_nb() function has been modified to forcefully delete these keys. Future improvements could involve implementing a cleaner solution, such as refining the clean_nb() function in the nbdev library.

[review-notebook-app[bot]]

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