Highlight transitioned from using Hygraph to GitHub as a headless CMS for managing their blog content, resulting in significantly improved build times and enhanced collaboration. By storing blog posts as markdown files directly in their GitHub repository, they eliminated the need for multiple API calls, reducing build times to approximately two seconds regardless of the number of posts. This shift also enabled engineers to utilize GitHub's features like pull requests, issues, and projects for better organization and collaboration, allowing the entire team to review and contribute to content effectively. The new workflow involved using Next.js and next-mdx-remote for rendering markdown, alongside gray-matter for parsing metadata, aligning with Highlight's open-source values while improving developer experience and operational efficiency.