Enable Custom Notebooks on Forked ABI Repo

[Florent]

Issue:

As a user, after forking the ABI repository, I am unable to add my custom notebook to my repo. This issue arises because the custom folder is currently set in .gitignore, which prevents any files within it from being tracked by Git.

Solution:

To resolve this issue, we need to modify the .gitignore file. The line that ignores the custom folder should be removed or commented out. This change will allow Git to track files within the custom folder, enabling users to add their custom notebooks to their forked ABI repositories.

[Florent]

@Dr0p42, I found a solution there: https://gist.github.com/wizioo/c89847c7894ede628071
Could you please have a look and let me know what you think?

[Florent]

As we discussed with @Dr0p42, we removed "custom" from gitignore.