[Topic] Heading structure in theme development

[rianrietveld]

URL: https://wpaccessibility.org/docs/topics/code/heading-structure/
Code: https://github.com/wpaccessibility/wp-a11y-docs/blob/main/docs/topics/code/heading-structure/index.md

Please read How to contribute before you start.

Tasks

This content needs to be reviewed and restructured.
Keep as much of the current text as you can.
Check the links.

See for the structure of an accessibility topic:
Write documentation: Content structure of an accessibility topic