The Clowder Project is an online reference work and wiki for category theory and mathematics. Built using Gerby, which was created by Pieter Belmans and Raymond Cheng, it follows the massively collaborative model started by the Stacks Project or the Automorphic Project.
As a completely static website hosted on GitHub pages, there is currently no system for on-site comments like those in the Stacks Project, Kerodon, or the Automorphic Project.
However, there's a dedicated Discord server, which you can join here. There you'll find channels for discussion and comments, hopefully partly making up for the lack of an in-site comment system.
Besides comments and discussions, the Clowder Project Discord server also has a dedicated channel for updates, collecting both major news regarding the project as well as periodic updates on additions to it that are currently being worked on.
In general, any and all comments, no matter how small (even things like very small typos), are extremely welcome, as are contributions.