Documentation Update: Mention docker compose exec connectivity

[sdavids]

Instead of using the Web Terminal one could use the following to connect to the Ansible control node:

$ docker compose exec -u ansible -w /home/ansible ubuntu-c /bin/bash

You might want to mention it in the video, README.md and/or on the Web Terminal tiles:

[spurin]

Thats a great command, really nice! I will look into a good home for this.