A first draft of them, at least. They probably need some editing.
Remove the "Application Lifecycle" page for now. I do intend to add
some docs about how fibers interact with the host app, but I can do
that later.
- Break embedding out into a separate section with multiple pages.
- Document the constraints on the API.
- Document the slot array and WrenValue.
Still lots more to do, but getting there...
