hugo new site pcs --format yaml
cd pcs
git init
hugo mod init pcsmod
hugo mod get github.com/imfing/hextra

add the following to hugo.yaml:
module:
  imports:
    - path: github.com/imfing/hextra

hugo new content/_index.md
hugo new content/docs/_index.md
hugo server --buildDrafts --disableFastRender