Sylvia/docs/doc 759

@jmclaus Hey Jean-Michel - I can't get this to work. When I create the component in my toy course, there's just a big blank box where the molecule should be. Can you look through this and let me know if some of the instructions are wrong? Thanks!
You only edit file, but you move another one - so "Edit one file" also seems misleading. I'm totally open to suggestions for this 'cuz I couldn't think of a non-clunky way to say it...