Liam Griffin enhanced developer experience in the Shopify/theme-tools repository by updating documentation to improve access to community resources. He replaced the Slack partner link in the README with a direct link to the Shopify Dev Community, streamlining onboarding and reducing reliance on external communication channels. This change, implemented using Markdown and leveraging skills in documentation and community engagement, centralized support and resource discovery for contributors. While the work focused on a single feature and did not involve bug fixes or code changes, it addressed accessibility and onboarding challenges, aligning with developer experience goals and maintaining consistency with repository guidelines and community standards.