Perfect, thanks!
This looks great. Filling in the gaps. :-)
I'll add my rote recommendation to update the existing pages (even if that involves a complete replacement), rather than starting new pages, because M:Grants:Learning patterns/Every new page starts off unwatched. E.g. https://www.mediawiki.org/w/index.php?title=OOjs_UI&action=info has 33 page watchers, and the subpages have fewer but still more-than-zero.
I changed the layout of the proposed ToC to be a table that includes existing pages (Assuming I didn't forget any)
From my quick glance on each, there are a few that we might want to split up and many we will want to rewrite, especially the introductory ones.
But I am hoping it's a start!
Oh, absolutely - the idea is to use existing pages (Which there are many) when possible - but the point of the ToC is to get a sense of the organization of the pages, what we have vs. what we're missing, and serve as a "todo" list for collaborating on documentation writing.
Also, the ToC can set the "spirit" of the documentation in general, which means that we could then get into the existing pages and improve them based on what is missing, etc.
So this is just supposed to give us a direction and galvanize the documentation "working group"; there are a bunch of pages we will need to write from scratch, but also a whole lot that we could already put in as existing.