Very soon, we'll start adding content under the folders learning/ and public/learning. We need to ensure that all of our tooling is working properly. Things to check:

• ./check
• ./fix
• ./start
• PR previews (requires updating _copy_local_content in builder.py)
• CI configuration, such as our detection of paths for when to run things

At least to start, learning should run by default. We don't need a --learning argument to any of our scripts.

We have not yet finalized the URL scheme, so focus on getting generic support for learning/ working. The URL will likely be something like /learning/courses/my-course/my-lesson.

Another thing to think about is how the home page for the preview is going to work 🤔 Right now, our preview app home page gives quick links to all of our different folders like /guides. That is really useful. But it's not going to naively work with Courses because each course will be its own folder with its own _toc.json. Naively, we'd need to update the code in closed source to enumerate every course, which requires updating it when a new course is added. That's brittle. Can we do something more clever? (Timebox this investigation to <2 hours)