Entrypoint shebang fix

[ilumsden]

Description

I made a bit of a mistake when adding license headers to some of the files. More specifically, I put the license header before the shebang in several shell scripts. As a result, those scripts cannot be properly run, leading to errors.

This PR fixes this.

Checklist

• If creating a new version of the tutorial, create a new directory at the root of the repository with the relevant name
• Ensure all Docker-related material except for tutorial contents goes in a docker subdirectory
• Update github_ci_matrix.json with (1) the tag you will eventually use for the tutorial Docker images (place in the "tag" field) and (2) the name of the directory for your version of the tutorial (place in the "tutorial_dir" field)

[ilumsden]

Also, @slabasan, I think there's an issue with the branch protection on develop. This PR is actually saying I could merge myself without any reviews.