Where is content for ERPNext User Guide?

The front page of the User Guide says pull requests with suggestions and fixes are encouraged[1], but the content doesn’t seem to be maintained at as part of the ERPNext project anymore (or at least I couldn’t find where it was). Am I missing something? What is the current intention of the future for the guide?

[1] Not Found footer reports content is managed in https://github.com/frappe/erpnext_org/tree/master/erpnext_org/templates/statics/user-guide (but this appears no longer correct).

With Version 5, statics have moved to www dir,

Correct link: