I recreated the the original pages-themes/hacker in HTML CSS JS which was in markdown and used ruby(Jekyll highlighting) so that this Hacker theme page can be use in other server and hosting site others than GitHub, which use standard .html format.
just get the file and edit them to your need and your good to go.
Login page
assets fix
Code highlighting from https://github.com/googlearchive/code-prettify
Footer from https://www.w3schools.com/w3css/4/w3.css
Font from https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css & https://fonts.googleapis.com/css?family=Lato