Replace old docs with new docs repo (#24201)

docs/guides/http/simple.mdx

@@ -0,0 +1,20 @@
+---
+title: Write a simple HTTP server
+sidebarTitle: Simple HTTP Server with Bun
+mode: center
+---
+
+This starts an HTTP server listening on port `3000`. It responds to all requests with a `Response` with status `200` and body `"Welcome to Bun!"`.
+
+See [`Bun.serve`](https://bun.com/docs/api/http) for details.
+
+```ts server.ts icon="/icons/typescript.svg"
+const server = Bun.serve({
+  port: 3000,
+  fetch(request) {
+    return new Response("Welcome to Bun!");
+  },
+});
+
+console.log(`Listening on ${server.url}`);
+```