Update Docs: Docker Setup

[HolmesDomain]

Update documentation for spinning up services on docker: https://docs.steel.dev/overview/self-hosting/docker#quick-start. steel-browser-ui image is no longer required as part of setup.

Discord related thread link: https://discord.com/channels/1285696350117167226/1285696350117167229/1419905587927322714

Device:
Mac M2, macOS

[thanhnguyen2187]

TL;DR: use ghcr.io/steel-dev/steel-browser:latest, and expose port 3000 and port 9223. The UI is available at :3000/ui.

docker run --rm -it -p 3000:3000 -p 9223:9223 ghcr.io/steel-dev/steel-browser:latest