Add Astro to site generator docs

docs/docs/getting-started.server.mdx

@@ -636,6 +636,33 @@ well.
 
 See [Using MDX with Next.js][next-mdx] for more details.
 
+#### Astro
+
+[Astro](https://astro.build/) is built on [islands architecture](https://docs.astro.build/concepts/islands/),
+allowing you to use React, Vue, Svelte, and more within your MDX files.
+
+After [creating your first Astro project](https://astro.new/), you can [add the MDX integration](https://docs.astro.build/guides/integrations-guide/mdx/):
+
+```shell
+astro add mdx
+# Or use "npx" on Windows
+npx astro add mdx
+```
+
+And (optionally) add your favorite component framework(s).
+You can import Markdown, Astro, and other MDX files as components
+out-of-the-box.
+
+```shell
+astro add preact
+# Or use "npx" on Windows
+npx astro add preact
+```
+
+[See the Astro documention](https://docs.astro.build/guides/integrations-guide/mdx/)
+for configuring layouts,
+built-in syntax highlighting with Shiki, adding YAML frontmatter, and more.
+
 #### Parcel
 
 [Parcel 2](https://v2.parceljs.org) has their own plugin to support MDX.