Add Astro guide (#4110)

docs/guides/ecosystem/astro.md

@@ -0,0 +1,72 @@
+---
+name: Build an app with Astro and Bun
+---
+
+Initialize a fresh Astro app with `bunx create-astro`. The `create-astro` package detects when you are using `bunx` and will automatically install dependencies using `bun`.
+
+```sh
+$ bunx create-astro
+╭─────╮  Houston:
+│ ◠ ◡ ◠  We're glad to have you on board.
+╰─────╯
+
+ astro   v2.10.5 Launch sequence initiated.
+
+   dir   Where should we create your new project?
+         ./fumbling-field
+
+  tmpl   How would you like to start your new project?
+         Use blog template
+      ✔  Template copied
+
+  deps   Install dependencies?
+         Yes
+      ✔  Dependencies installed
+
+    ts   Do you plan to write TypeScript?
+         Yes
+
+   use   How strict should TypeScript be?
+         Strict
+      ✔  TypeScript customized
+
+   git   Initialize a new git repository?
+         Yes
+      ✔  Git initialized
+
+  next   Liftoff confirmed. Explore your project!
+
+         Enter your project directory using cd ./fumbling-field
+         Run bun run dev to start the dev server. CTRL+C to stop.
+         Add frameworks like react or tailwind using astro add.
+
+         Stuck? Join us at https://astro.build/chat
+
+╭─────╮  Houston:
+│ ◠ ◡ ◠  Good luck out there, astronaut! 🚀
+╰─────╯
+```
+
+---
+
+Start the dev server with `bunx`.
+
+By default, Bun will run the dev server with Node.js. To use the Bun runtime instead, use the `--bun` flag.
+
+```sh
+$ bunx --bun astro dev
+  🚀  astro  v2.10.5 started in 200ms
+
+  ┃ Local    http://localhost:3000/
+  ┃ Network  use --host to expose
+
+01:48:34 PM [content] Watching src/content/ for changes
+01:48:34 PM [content] Types generated
+01:48:34 PM [astro] update /.astro/types.d.ts
+```
+
+---
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result. Astro will hot-reload your app as you edit your source files.
+
+{% image src="https://github.com/vitejs/vite/assets/3084745/bb1d5063-32f4-4598-b33e-50b44a1c4e8a" caption="An Astro starter app running on Bun" %}