This is a Jekyll / Github Pages site.
It uses the Slate theme for regular pages, and a custom theme based on 'Story' by HTML5UP for map-based stories.
Prerequisites:
- Ruby+DevKit (currently using v2.7.5)
gem install bundler
Build and start dev server:
bundle install
bundle exec jekyll serve
If it no longer matches behaviour seen online, try updating dependencies. Also, GitHub Actions may do some extra magic.