Bumps gem github-pages and adds webrick

[JellyTitan]

The Gemfile for the jekyll docs is out of date. When attempting to run locally, it throws errors:

The updated Gemfile bumps the gem github pages to v231

Also adds the gem [webrick](https://rubygems.org/gems/webrick/versions/1.3.1?locale=en) to support a local https server.

To test this update, pull it locally. If you already have Ruby setup for jekyll pages, from the docs folder you can run bundle to install the gems. (You may need to run bundle update). Run bundle exec jekyll serve to spin up a local server. If things work as expected, you should get a local server running:

This has been confirmed to work on a Mac. This should also be tested on a windows machine. (There are additional gems to support windows, indicating windows support is required).