I am a student of Seneca College, BSD (Bachelors of software development) program. We have a bunch of BTP (coding related) courses.
Those courses have a website tree. And it is functional, but doesn't look that good. Websites mentioned: https://ict.senecacollege.ca/~btp100/
https://ict.senecacollege.ca/~btp200/
https://ict.senecacollege.ca/~btp305/
This google chrome extension fixes the look of those websites.
It also has a dark theme!