Errors found in `modules_and_packages`

[Snowwpanda]

• Generating the github token is not documented so well, we need to tell them which access rights they need to use and maybe more
• Renaming gitignore is not possible
• Pushing your changes from within GitHub Codespaces was not possible, no prompt appears to enter username/password

[edoardob90]

I would also

• Switch to SSH to push to GitHub. It's not more complex than with tokens, which don't work. We just need to update the instructions in the notebook
• It's not a bug, but consider Modules and Packages: avoid the need to restart the kernel #279

[yakutovicha]

A more general issue, but related to modules and package section: #281