
No longer maintained, depreciated, features are now in gatsby-theme-catalyst-core
The Gatsby Theme Catalyst Onepage is an interesting addition for those looking to enhance their web projects with a modern design aesthetic. However, it's important to note that this theme has been deprecated and integrated into the core theme as an option. This change might raise questions for those who were initially attracted to the standalone features of the Onepage theme.
Transitioning to the core theme offers users the opportunity to access a more comprehensive range of functionalities and updates. By consolidating the themes, Gatsby has streamlined the user experience, ensuring that developers have access to a more robust template for their projects without the clutter of multiple versions.

GatsbyJS is a free and open-source static site generator based on React. It uses a modern development stack including Webpack, GraphQL, and modern JavaScript and CSS frameworks. It also provides a rich set of plugins, starters, and themes.
React is a widely used JavaScript library for building user interfaces and single-page applications. It follows a component-based architecture and uses a virtual DOM to efficiently update and render UI components