Show expected Docker compose output in README

[rachhouse]

Addressing review feedback that arrived post-PR: include the expected terminal output of Docker compose in the README.

Check out the rendered README here: https://github.com/greatexpectationslabs/tutorial-gx-in-the-data-pipeline/tree/show-docker-compose-output?tab=readme-ov-file#quickstart

[r34ctor]

The only change to consider making is to add instructions for what to do if a user does not see this output, but that is pretty minor.

[rachhouse]

The only change to consider making is to add instructions for what to do if a user does not see this output, but that is pretty minor.

@r34ctor Thanks for the review! That's a good point. I'm need to give it a bit of thought, so I'm going to merge this PR for now while I think about how to address it. The key considerations are:

1. I don't want to bog down the Quickstart with a lot of detail that ideally most users won't need.
2. A link to a troubleshooting page or section that covers the issue could be a good alternative. However, if the Docker compose command doesn't run as expected on a user's machine, there's limited guidance we can give (other than "try it again") without knowing the user's specific error.