At my job, we try to separate documentation into technical, fast changing, repo specific information in the repo Readme and "how to", reference, big picture documentation into an external tool.
We use Confluence and I have several issues with it. Primarily, the web based editor is terrible and it doesn't let you see access statistics (without a plugin, last time I checked.)
The first contributes to documentation being stale because none of the developers want to futz around with it in addition to their project Readme. The second means that you can't look at the ratio between access and last modified times.
High Access/High Modification: crucial and currently changing information that needs to be monitored for accuracy fairly regularly
Low Access/Low Modification: non crucial, but also probably no longer relevant and is cruft that could be removed.
High Access/Low Modification: important information that may be outdated and should be reviewed.
Low Access/High Modification: potentially indicates a notepad situation that could identify a "knowledge silo" with one developer.
Is there a tool that can do this sort of analysis, offers a web interface for non developers, but also allows local editing?