Expands the brief client-side steps into a standalone section covering
prerequisites, fetching the repository key, the one-line and deb822 source
forms, auth for a private owner, install and verification, troubleshooting,
and removing the repo. Step 4 of the publishing flow now points at it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>