Ian Sinnott's article details the process of migrating a blog from Hexo to Gatsby, emphasizing Gatsby's flexibility and power in static site generation. The migration involves several steps, including preparing the existing blog for migration, configuring Gatsby to handle markdown, querying markdown files using GraphQL, and generating static pages. Sinnott explains the necessity of cleaning up the source repository, setting up Gatsby's file structure, and customizing the layout and data queries using GraphQL. He highlights the use of plugins for handling markdown and adds custom data to the GraphQL schema to generate URLs for blog posts. The article underscores Gatsby's extensibility and its capability to handle arbitrary data sources, though it acknowledges some areas, like the global GraphQL object, that could benefit from improvement. Despite these minor drawbacks, Sinnott advocates for Gatsby as a superior static site generator due to its powerful plugin API and automatic code splitting features.