Add Docker Compose in /docker

Since Docker Compose is very popular, I think it is worth bringing up the Docker Compose file (compose.yaml or docker-compose.yml) and the docker compose command at the of the /docker page.

Locate the documentation source file for the `/docker` page mentioned in the issue and update that page to include Docker Compose guidance. Add concise wording about the Compose file names (`compose.yaml`/`docker-compose.yml`) and the `docker compose` command in the existing Docker docs flow. Then preview or render the `/docker` page to verify the new section appears in the right place with clear wording.

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