Uses gatsby.
All pages are in src/pages/. The markdown files under src/pages/guide and src/pages/community are probably of most interest.
npm install
npm run develop
That'll start a hot-loading server & you can make changes & see the results.
If you have push access, to deploy a new version of the site, go to the source branch and do:
npm run deploy
For info on how gatsby works, take a look at their docs.