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!
AWS S3 is a storage system, so it doesn't appear anywhere in the URL. For example, edX has an AWS S3 account that holds a lot of "buckets" (the technical term; they're like folders). If I upload something to the edx-static bucket in AWS S3, the URL is `http://files.edx.org`. I didn't think that would be much clearer for the user, so I just used myfiles.example.com. I noticed that I forgot to include the MoleculeViewerFiles part of the URL... yikes...