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/second-commit-with-log

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+cd /tmp/demo/
+echo "$ git commit -m \"Change \\\"Hello\\\" to \\\"Hello World\\\"\""
+git add greeting.py
+git commit -m "Change \"Hello\" to \"Hello World\""
+echo "..."
+echo "$ git log"
+git -c color.ui=always log
+