make target to generate slides
First introductory slides.txt
Revert "First introductory slides.txt"

This reverts commit b5a7b9c9967bd1a4b4a570a755e592e4f326665c.
Revert "Revert "First introductory slides.txt""

This reverts commit 24dc4b5c8dcc01a625cfcf27de66bbd2b43dc376.