enhancement: Getting started guide doesn't make any sense

[Fusseldieb]

Is your feature request related to a problem? Please describe.
A "problem" in a sense that the directions don't make any sense in the "Getting Started" guide.

Describe the solution you'd like
Enhance the "Getting started" guide. Currently, it tells me to simply start a docker container, but it doesn't even download it first, which makes the entire command fail.

Link: https://docs.openwebui.com/getting-started/#one-line-command-to-install-ollama-and-open-webui-together

docker compose up -d --build

A command to download the package is needed, which is missing.

Describe alternatives you've considered
I've had to reach to third-party sites to get a working docker setup command for open-webui. More specifically this one.

Additional context
From what I've seen, only git clone is missing from the guide. This wasn't obvious, to me at least. I thought there was a image that could be fetched from somewhere.