I think the best software to use is a book publishing one because you can break it out by "chapters" (lectures) and you can script the entire course. Now to find the best one, I did a little digging on this website and I found that the easiest one to use (for collaborating) is Google Docs. Just FYI if anyone ever stumbles across this very issue https://thewritepractice.com/best-book-writing-software/
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