Well, if you want to create a website like this one, all you have to do is:

  1. Install Jekyll on your machine, from here.
  2. Run these commands: 
    jekyll new mywebpage
cd mywebpage
bundle exec jekyll serve

Navigate to localhost:4000 from your browser, and you should see your new website!

If you edit something and want to rebuild your site, open the terminal and run bundle exec jekyll build