Make the first page

Create a document under the root and it is a page, with an address derived from its label. Rename it and the page moves; the old address keeps working, because the vacated slug is remembered as an alias.

That is the whole model, and everything else on this site is a consequence of it: the navigation is the tree's top level, the feed is the pages whose type says they are published, the sitemap is every reachable slug.