convert a new version of pumping notebook to markdown

This takes over Jay's changes from
!40
3 jobs for pumpingv2 in 4 minutes and 25 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed execute_ipynbs #224761

00:03:32

passed mirror to github #224762

00:00:28

 
  Deploy
passed upload test website #224763

00:00:53