Use stackablectl everywhere

[fhennig]

We should use stackablectl everywhere, most notably in:

• Getting started
• Quickstart
  • This line ./create-test-cluster.py -o nifi druid superset --example cannot yet be done with stackablectl because it doesn't have the example functionality yet (2022-06-02)
• The End-to-end data pipeline tutorial

[fhennig]

This PR should be finished before we can continue on this ticket: stackabletech/stackablectl#32

Once this is merged we can use a sample stack in the Quickstart, I think that will be really nice.

[fhennig]

The getting started guides and the tutorial use stackablectl now, and for the quickstart there is a new ticket:

#249