Backup when shell not working

[drjwbaker]

Sometimes shell doesn't work on an attendees laptop: it is installed incorrectly, they've installed the wrong thing, it just unfathomably doesn't work.

Now, peer programming is great from a pedagogical point of view, so "work with someone else" is a good option. But prompted by @weaverbel, we should consider adding a backup to our Instructor Notes.

The suggestion is to recommend https://www.pythonanywhere.com Workflow will need to be added for grabbing the lesson data with wget.