How to use Bootstrap 4's “site\docs\4.4\examples” Folder contents using Jekyll on GitHub Pages?

In the examples folder of Bootstrap 4 , I was wondering on how to use and view its contents as everytime I open an index.html file to my browser it looks like this:

I know I have to use Jekyll for this but how am I supposed to use it to view the documents properly on GitHub Pages? Am I supposed to install Jekyll first?

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Hey! Check out this article: Testing your GitHub Pages site locally with Jekyll - GitHub Docs for details on testing and running your GitHub Pages site locally with Jekyll.