A lot of work on the presentation

The shell auto-image now runs code and turns the output into an image
that is embedded into the document

The prompt is configurable in /bin/prompt

The first draft is done up until the references section

shell/first-commit

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+cd /tmp/demo/
+echo '$ git commit'
+echo -e "Add greeting.py\n\nAdds the first file, currently always prints Hello" | git -c color.ui=always commit -F -