Update Svelte Kit Docs (#4541)

* Update Svelte Kit Docs

I added some guidance about how to build for production. Still WIP since I would like to add a more complete deployment guide.

* Formatting

---------

Co-authored-by: Colin McDonnell <colinmcd94@gmail.com>

docs/guides/ecosystem/sveltekit.md

@@ -63,3 +63,58 @@ Visit [http://localhost:5173](http://localhost:5173/) in a browser to see the te
 ---
 
 If you edit and save `src/routes/+page.svelte`, you should see your changes hot-reloaded in the browser.
+
+---
+
+To build for production, you'll need to add the right SvelteKit adapter. Currently we recommend the
+
+`bun add -D svelte-adapter-bun`.
+
+Now, make the following changes to your `svelte.config.js`.
+
+```ts
+- import adapter from "@sveltejs/adapter-auto";
++ import adapter from "svelte-adapter-bun";
+import { vitePreprocess } from "@sveltejs/kit/vite";
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+  kit: {
+    adapter: adapter(),
+  },
+  preprocess: vitePreprocess(),
+};
+
+export default config;
+```
+
+---
+
+To build a production bundle:
+
+```sh
+$ bun run build
+ $ vite build
+
+vite v4.4.9 building SSR bundle for production...
+transforming (60) node_modules/@sveltejs/kit/src/utils/escape.js
+
+✓ 98 modules transformed.
+Generated an empty chunk: "entries/endpoints/waitlist/_server.ts".
+
+vite v4.4.9 building for production...
+✓ 92 modules transformed.
+Generated an empty chunk: "7".
+.svelte-kit/output/client/_app/version.json      0.03 kB │ gzip:  0.05 kB
+
+...
+
+.svelte-kit/output/server/index.js               86.47 kB
+
+Run npm run preview to preview your production build locally.
+
+> Using svelte-adapter-bun
+  ✔ Start server with: bun ./build/index.js
+  ✔ done
+✓ built in 7.81s
+```