[v6] stabilize experimental.headingIdCompat

[florian-lefebvre]

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For Astro version: 6.0. See astro PR #14494.

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[sarah11918]

Looks good, but see my comment re: including how to build a custom rehype plugin inside this guide 😅

[florian-lefebvre]

Is there a reason why you used js instead of ts?

[delucis]

Mostly because that's what most of our examples do. But also because it means you can inline it in your config file if you like even if that is .mjs.