To get started on using Jekyll for a website hosted on Github pages, please see the Github pages documentation.
Once you have jekyll set up and this repo cloned, to preview locally, use the following command.
bundle exec jekyll serve --host=<IPADDRESS of m/c you are running from>
This gives you an URL that you can then paste in your browser.
Before previewing, change _config.yml so both baseurl and url are "".
This website uses theme slate.
For more information on how to use Jekyll themes and override theme defaults, visit the Jekyll documentation for themes.