The Super Collaborator explored online collaboration based on Croquet. We've stepped back from this interaction but think its graph merging mechanism will be useful for relating "read me" level documentation across many repos.
This snapshot of work in progress will show a single html file that implements the non-collaborative version along with sample jsonl data automatically generated from source code annontations. Try it. readme 
pages/solo-super-collaborator
The sample data above is from the Federation Search service annotated as part of this experiment based on a real need for a system model. github
See Drawing Automation for more about our methodology.
See Solo Reads and Writes with files and on pages.
See Site Link Map for solo exploration of a pattern site.
See Zoom to Group to recast a cluster as its own graph.
See Utility Converters borrowed from the original app.