A contribution guide can be found in CONTRIBUTING.md
The documentation is built using hugo and hugo-theme-learn. The theme is included in the repository using the git submodule command. To update the theme to the latest version, use the follwing commands:
git remote add theme https://github.com/matcornic/hugo-theme-learn.git
git fetch theme master
it subtree pull --prefix docs/themes/hugo-theme-learn theme master --squash