Setting up for local development

There are probably different ways to go about this, but sometimes what matters is to have one at all. Doing the following was tested by @consideRatio 2019-10-19 on Ubuntu 19.04.

1. Install Ruby, Gem, and Bundler.

   1. Install rbenv.
   2. Install the rbenv-build plugin to allows you to use rbenv install.
   3. Run rbenv install <version> with the latest stable version.
   4. Run rbenv global <version>.
   5. Verify you can run ruby -v and gem -v.
   6. Run gem install bundler to work with Gemfiles etc.

2. Install Jekyll.

   1. Checkout the gh-pages branch with git checkout gh-pages.
   2. Run bundle install

3. Start a local webserver.

   1. Run bundle exec jekyll serve.
   2. Visit http://localhost:4000.