These instructions are for Mac. Translation to other platforms left as an exercise for the reader.
1: Install GCC
xcode-select --install
2: Install Homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
3: Install rbenv
brew install rbenv`
echo 'eval "$(rbenv init -)"' >> ~/.zshrc
... and restart Terminal
These instructions should be run from within the project directory
1: Install Ruby
rbenv install $(cat .ruby-version)
2: Install Gems
bundle install
1: Start the Jekyll server
jekyll serve
2: Open a browser and navigate to http://localhost:4000