Add Astro to site generator docs

docs/docs/getting-started.server.mdx

@@ -636,6 +636,41 @@ well.
 
 See [Using MDX with Next.js][next-mdx] for more details.
 
+#### Astro
+
+[Astro](https://astro.build/) has an [official MDX integration](https://docs.astro.build/guides/integrations-guide/mdx/).
+Astro recommends using [the `astro add` CLI](https://docs.astro.build/en/guides/integrations-guide/#automatic-integration-setup)
+to install dependencies and update your config automatically:
+
+```sh
+# Using npm
+npx astro add mdx
+# Using yarn
+yarn astro add mdx
+# Using pnpm
+pnpx astro add mdx
+```
+
+This base setup allows you to import Markdown,
+[Astro components](https://docs.astro.build/en/core-concepts/astro-components/),
+and other MDX files as components.
+
+**To add support for [Preact](https://docs.astro.build/en/guides/integrations-guide/preact/), [Vue](https://docs.astro.build/en/guides/integrations-guide/vue/), [Svelte](https://docs.astro.build/en/guides/integrations-guide/svelte/) and more in your MDX,**
+you can install each as a separate integration:
+
+```sh
+# Using npm
+npx astro add preact
+# Using yarn
+yarn astro add preact
+# Using pnpm
+pnpx astro add preact
+```
+
+To learn how to configure layouts, YAML frontmatter, and set up Astro’s
+syntax highlighting, [see their MDX
+integration docs](https://docs.astro.build/guides/integrations-guide/mdx/).
+
 #### Parcel
 
 [Parcel 2](https://v2.parceljs.org) has their own plugin to support MDX.