Numbering for chapters and notebooks discrepancy

[kfahn22]

There is a difference in how chapter number / ordering of the notebook folders -- I am not sure if it matters.

[snehilsanyal]

I think it won't matter after doc building, as the filesystem is sorted in this manner: 1, 10, 11, 12, 13, 2
This can be avoided if we use leading zeroes for all single units like 01, 02, 03 ....

[kfahn22]

It wasn't the order that I was concerned about, but the numbering. Synthetic data creation is Unit 10 in chapters and Unit 11 in the folders for notebooks. I just don't know if that matters.

[johko]

oh, well I think it should be the same. Can you create a PR to fix it @kfahn22 ?