fix(eleventy-plugin-mdjs-unified): handle anchors in MD files

[LarsDenBakker]

What I did

Fixes https://github.com/daKmoR/rocket/issues/161

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 19cfca0dfe00cf9f3cedb1f69000a9185ce56df4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------------ | ----- | | @d4kmor/eleventy-plugin-mdjs-unified | Patch |

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[daKmoR]

nice catch 👍

and thx for the fix 🙇‍♂️