I have cloned a Jekyll Bootstrap installation with GitHub pages. Everything is working but the CSS and JavaScript aren't being loaded in the website. It looks like a barebones HTML site.
Here is the website: https://heavensgospel.github.io/
Here is the website's files: https://github.com/heavensgospel/heavensgospel.github.io
Apparently those files are missing from your file system.
Your /assets/themes/bootstrap/css/
folder seems to contain only one file style.css
, while other files seem to be missing. Similarly, JavaScript files too are missing.