Deep Linking in Docs

Currently in the documentation, you can click a top-level item, or one of its children, if you click a child, it takes you to a dedicated page for that child. It would probably be better if it took you to the top-level page but scrolled you to that item, and added a `#` to the URL, rather than a unique URL.

The issue names only the documentation navigation between top-level items and child items; no files, tests, or entry points are provided. Start by locating the code that generates those links and pages, then verify that a child link opens its top-level page, scrolls to the matching item, and includes a hash in the URL.

Written by the indexing model from the issue text.