Another maintainability challenge was propagating changes across many GitHub repositories. Within the [Project Pythia Github organization](https://github.com/ProjectPythia/) we currently have 75 different repositories, the vast majority of which contain some website source under the big trenchcoat masquerading as one single Project Pythia website. Each repository is deployed within the domain, but there are separate repositories for our [home page](https://projectpythia.org/), [Foundations book](https://foundations.projectpythia.org/), [resource](https://projectpythia.org/resource-gallery/) and [Cookbooks galleries](https://cookbooks.projectpythia.org/), and for each individual Cookbook. With the Sphinx infrastructure, while the site theming could be abstracted into its own package, other changes to the site configuration or appearance, specifically of the links included in the top nav-bar or footer, would have to be individually updated in every single repository for consistency. We could update our Cookbook Template repository, but GitHub has no one way of sending those divergent-git-history changes to the various Cookbook repositories that leveraged that template. The MyST [`extends` keyword](https://mystmd.org/guide/frontmatter#composing-myst-yml) in the configuration file allows us to not only abstract theming, but also configuration commands and content. Future changes to the site navbar will only have to be made in one place, and individual Cookbook authors will be able to focus on their own content with much reduced boilerplate!
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