Add link to deploy docs for bun (#1077)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: amirhhashemi

src/routes/solid-start/reference/config/define-config.mdx

@@ -54,6 +54,7 @@ An overview of all available presets is available in the [Deploy section of the
 
 - [Node.js Server](https://nitro.unjs.io/deploy/runtimes/node#handler-advanced) (`node`) (Default)
 - [Deno Server](https://nitro.unjs.io/deploy/runtimes/deno) (`deno_server`)
+- [Bun Server](https://nitro.build/deploy/runtimes/bun) (`bun`)
 
 **Providers**