docs: Link docker usage to associated GHCR page

[polarathene]

Since #152 has had no maintainer action yet, at least this minor change partially improves the UX for readers to discover/reach the GHCR page.

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Summary by cubic

Make the Docker run example in README link to the GHCR package page for ghcr.io/natesales/q, improving discoverability of the image and tags.

^{Written for commit ec52792. Summary will update on new commits. Review in cubic}

[cubic-dev-ai]

No issues found across 1 file

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