Add docs for frameworks we've tested

Even without direct integration, we can show examples and general usage on working with some of the existing frameworks.

For example, I'm using Contentlayer in an Astro project. And there are important notes on how to do this, including some workarounds.

The issue names Contentlayer and an Astro project but does not identify any files, tests, or documentation entry point. Start by locating the existing framework documentation and confirming which tested frameworks and workarounds should be covered. Done means the agreed examples and important usage notes are documented.

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