Rework anchors for accessibility.

Asherah Connorrequested to merge
push-utmrymnlmvkm into main

What does this MR do and why?

This is a second run at !76 (merged) (reverted in !108 (merged)); see gitlab-org/gitlab!183564 (merged) for the MR against GitLab and Heading anchor links aren't announced correctly... (gitlab-org/gitlab#463385 - closed) for the parent issue.

We introduce the new output style as an option, so we can opt into its use, or remove it later.

Edited by Asherah Connor

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