add HTML comments, update python style, and minor python script fixes

[TimidRobot]

Description

add HTML comments, update python style, and minor python script fixes.

Other information

There's a lot of files changed by this pull request. Please review the python code and spot check the HTML files. When spot checking the HTML files, pay attention to the domain. Some of the links in the HTML files are absolute and will take you to production. You can begin spot checking the HTML rendering by starting from:

• TESTING CC BY-NC-ND 4.0
• TESTING CC BY-NC-SA 4.0
• TESTING CC BY-NC 4.0
• TESTING CC BY-ND 4.0
• TESTING CC BY-SA 4.0
• TESTING CC-BY 4.0

Checklist

• [x] My pull request has a descriptive title (not a vague title like Update index.md).
• [x] My pull request targets the master branch of the repository.
• [x] My commit messages follow best practices.
• [ ] I added tests for the changes I made (if applicable).
• [ ] I added or updated documentation (if applicable).
• [x] I tried running the project locally and verified that there are no visible errors.

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[TimidRobot]

This PR lays the foundation for addressing add_cc4_links.py is unreliable and inconsistent · Issue #1063.

[TimidRobot]

deployed to production