This file is rendered by linking to it with md=....
Markdown files can carry a YAML page preface for page-level controls, then normal Markdown content below it.
The page preface at the top of this file sets config.markdown.toc: true,
so the generated page gets a collapsible table of contents when enough headings
are present.
The rest of the file is normal Markdown. You can use headings, lists, links, tables, math, code blocks, and inline HTML when you need it.