The documentation system requires Ruby 2.6 to be installed. Ruby 2.7 or higher could result in a dependency failure.
$ brew install rbenv
$ rbenv init
$ rbenv install 2.6.8
$ rbenv global 2.6.8
$ gem install bundler
$ bundle install
$ bundle exec middleman server
To view the docs, navigate to http://localhost:4567 in your browser.
$ ./deploy.sh