rage/programming-26 ? reverse-engineered prompt

Build me the website for this programming course, and make it easy to update the actual course content from the data folder. I want a clean course site that can show lessons, instructions, and other markdown based material nicely, with any custom course components working too.

Please make sure the site is pleasant to read, works well on mobile, and is easy for course staff to edit without touching the main site code every time. If there are any missing pieces, use the existing content and structure in the repo as the source of truth, and look up current docs online if you need to.

Also make the local development setup smooth so I can run the site, test content changes, and preview updates without a lot of manual steps. If there are quiz or course state integrations in the repo, keep them working and make it easy to use local versions for testing.