The theme is in a separate repository: https://github.com/corda/hugo-r3-theme so that we can reuse it in other sites.
Specifically, the theme is shared with https://github.com/corda/api-site which hosts the Javadoc/dokka api documentation.
To bring in an updated theme:
# IMPORTANT: ensure you have no modified files
cd docs-site
git checkout -b theme-update
./pull-theme.sh
git push -u origin theme-update
and that's it.
DO NOT make theme edits in this repository.
The instructions are in the other repository, see https://github.com/corda/hugo-r3-theme