WIP: add salt tutorial
This MR adds the tutorial page for the Salt tutorial.
Planning codimd: https://codimd.web.cern.ch/8xb9GfAjSamqHBRZEmP7WQ#
Edited by Philipp Gadow
This MR adds the tutorial page for the Salt tutorial.
Planning codimd: https://codimd.web.cern.ch/8xb9GfAjSamqHBRZEmP7WQ#