Created by: mtthwhggns
After my last PR, (https://github.com/a11yproject/a11yproject.com/pull/438), it was suggested that the project could use the github-pages gem.
Github is now using Jekyll 3.2.1 for pages, and a dependency error stopped the old Gemfile.lock from working in development.
This uses the github-pages gem to ensure that Github-compatible versions
of gems are being used and fixes the development error.
Thanks to @nschonni for the suggestion.