gatsby-starter-minimal-blog | Typography driven , feature-rich blogging theme | Frontend Framework library

The repository that you have provided introduces the concept of shadowing by Gatsby's themes. This is a feature that allows you to replace the /src folder with your own custom implementation. From Gatsby documentation:

Gatsby themes introduce a concept called “shadowing”. This feature allows users to replace a file in the src directory that is included in the webpack bundle with their own implementation. This works for React components, pages in src/pages, JSON files, TypeScript files, as well as any other imported file (such as .css) in your site.

A practical use case is when you’ve installed gatsby-theme-blog and want to customize the author Bio component to add your own biographical content. Shadowing lets you replace the theme’s original file, gatsby-theme-blog/src/components/bio.js, with your own file to make any changes you need.

As you can see in your dependencies, the repository includes @lekoarts/gatsby-theme-minimal-blog where you can find all these shadowing configurations.

When shadowing, your ability to customize the structure is limited to the configuration of the shadow implementation itself, so, if you want to customize this starter, you should place your files into /src/@lekoarts/gatsby-theme-minimal-blog/ to shadow/override files with your own structure. However, if you want to change the UI theme you should override the starter files by adding your own configuration under /src/gatsby-plugin-theme-ui/ as you can see in the starter README.md.