The site is built using middleman, which uses ruby.
This is how I set it up in Ubuntu 17.
apt install ruby-dev ruby ruby-bundlerFrom the repository root run the following command.
bundle installbundle exec middleman serverbundle exec middleman buildThe env/ folder in the repository root directory contains different build environment. They basically just say which url to use to link to the contact / volunteer forms.
To build in debug:
source env/debug
bundle exec middleman buildTo build in release:
source env/release
bundle exec middleman build