Putting the heading in the navigation element makes the structure more
logical and matches the behavior of most other websites.
Move it before the introduction in my web best practices post.
- Give the intro a heading
- Make the preface an <aside> with a "doc-preface" DPUB-ARIA role
- Move the TOC before the intro
- Give the TOC a "doc-toc" DPUB-ARIA role
- Provide a TLDR