Add `tree: true|false` front-matter key (default to true)
to disable the left-hand nav tree on a per-page basis

Disabling the tree also disables reading time

Disabled tree on search, sorry, thank-you-subscribing-docker-weekly

Use null layout for allpagelinks.md and limit it to pages that have a title
(which leaves out redirects, which are not real pages)

Add site-generation date and time to footer, in a tiny unobtrusive font