Docs layout example
This page exists to demo the page-docs.html / section-docs.html templates:
an expandable section menu on the left, article content in the middle, and a
scroll-spy table of contents on the right that highlights the current heading
as you scroll.
The menu on the left isn't hand-written — it's built automatically from this
folder's own structure. Drop a few .md files in a folder and they show up
as sibling links; add a subfolder with its own _index.md and it becomes a
nested, auto-expanding group. See Getting Started and
Reference for both in action.