Ship a website, get ice cream!
Website for the Swirl YSWS! See it in action at swirl.hackclub.com.
make sure you have Ruby and RubyGems installed. you can find installation instructions at ruby-lang.org.
also make sure you have bundler installed. you can install it with gem install bundler.
then, all you've got to do is run bundle install and then jekyll serve (or bundle exec jekyll serve) to start the server.