The app is actually markdown file viewer. It loads assets/md/index.md file when you navigate to index.html on your website. The app may draw math formulas and mermaid graphs.
- React, mermaid example https://www.andynanopoulos.com/blog/how-to-integrate-next-react-mermaid-markdown
- React markdown with plugins example https://blog.logrocket.com/how-to-safely-render-markdown-using-react-markdown/
- React markdown loader example https://stackoverflow.com/a/52280005