* docs(seed): Document how to edit and test challenges
add seed/README.md documenting scripts and schema for challenges
edit challenge-style-guide with mongodb id generation info
Closes#16373
docs(seed): add Ethan's video, apply PR feedback
* docs: fix up syntax highlight
While it was ideal to have ```json, its not really doing anything in terms of highlight. But, the side effect in diff is making the other parts really ugly and unreadable.
Hence fixing up.
Alex Chaffee