Update quickstart guide with stackablectl

[siegfriedweber]

The quickstart guide shows how to setup a Stackable cluster with the create_test_cluster.py script. When stackabletech/stackablectl#36 is finished then it should be changed to use stackablectl.

[vsupalov]

This issue was mentioned in the marketing meeting today. It would be great to update this, so marketing material can link to a guide using stackablectl, and provide an example command which is echoed in the guide.

I'll add it to the board.

[fhennig]

The "example" doesn't really exist anymore, i've talked to Sebastian and he suggested to use the trino-taxi-data demo in the quickstart.