fix: make docs more explicit for beginners

[Chev91]

As a novice, I played around with Play With Docker and had some success installing manually without Docker, but when it came to running Docker Compose locally on my own machine I got very lost.

My proposal here is to add an additional step to help people in a similar position to make sure they can easily follow the quick start guide.

[dnk8n]

I had similar issues, this would have saved me a few hours.