I am an author of the German Wikibooks project Mathe für Nicht-Freaks. We have more or less 20 authors and since we concentrate on articles with high educational quality, we have an elaborated workflow for writing an article. In order to manage our project we currently have an Excel list. However, we noticed that we need better tools. In particular we want to use a Kanban board for managing our project. Phabricator will be ideal for us. Can https://phabricator.wikimedia.org/ also be used by a Wikibooks project (which is not a software project)?