Git repository overview at https://katzenpost.network/docs/getting-started/#overview-of-our-git-repositories contains no links.
The only way to use it is to go to https://github.com/katzenpost GitHub organization and try to find the repository. Some of the repositories have since been migrated to monorepo, so you need to follow the link left in archived repo if there is some or try to find described project in the monorepo.
I tried to add links in PR katzenpost/katzenpost#507 but it was closed without merging.