[issue2551322] Add skip links to TOC in docs pages

New submission from John Rouillard:

A number of docs pages have large Tables of Contents. Tabbing through them to get to the
start of the text is a pain.

Consider adding a skip link before the TOC to jump to an anchor after the TOC.
Some pages have section toc's as well. Add there too.

I think this has to be done using html with the

  .. raw:: html

directive. Also some css has to be added to hide the skiplink unless focused.
Adding an id to the main tag in the layout and making it focusable (tabindex=0)
is probably needed as well.

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components: Documentation
messages: 7954
nosy: rouilj
severity: normal
status: new
title: Add skip links to TOC in docs pages
type: behavior

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<https://issues.roundup-tracker.org/issue2551322>
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