Within-section navigation missing for smaller screens, global contents difficult to navigate.

Documentation

Problem

Within a documentation section (I'm using that term to refer to sub-documents like, say, the tutorial, not sure if there is an official term), there is currently no way to go "up" a level to see the contents of that section when not using a full width screen:

Full width screens have breadcrumbs at the top

The "table of contents" link takes you back to the global contents, which are not usable, as they contain every header from every document in the docs - take a scroll if you haven't in awhile: https://docs.python.org/3/contents.html

It's also not obvious which document you are in, as "table of contents" is ambiguous - the only place that "tutorial" is present is in the URL.

This makes it quite challenging to navigate the docs on mobile, or when splitting a screen and reading in a narrow window.

Desired solution

I would like...

• the sidebar "Table of Contents" to be replaced with the title of current document section when one is within a document section (eg. /{version}/tutorial/interpreter.html), and with a link to the global ToC when one is in a section ToC (eg. /{version}/tutorial/).
• The maxdepth of the global ToC to be reduced to 2 to make it usable

I will follow on with a PR momentarily...

Linked PRs

• gh-123453

首先檢查文件側邊欄導覽、全域目錄，以及 /{version}/tutorial/interpreter.html 和 /{version}/tutorial/ 等章節 URL。完成的標準是：窄螢幕能夠識別目前的章節，提供返回該章節內容的導覽，將章節 ToCs 連結至全域 ToC，並將全域 ToC 的 maxdepth 限制為 2。issue 中已經參照了一個已連結的 pull request。