Quick Start assumes Docker is installed on Linux #267
Description
Problem
Following the Quick Start on a fresh Ubuntu / WSL environment fails because
Docker is not installed by default.
The guide assumes docker is available, but on Linux this requires
manual installation.
Impact
New users get stuck early with:
docker: command not found
Suggestion
Add a short Linux-specific Docker installation step to the Quick Start,
or clarify that Docker must be installed separately on Linux/WSL.