Replace old docs with new docs repo (#24201)

docs/guides/http/hot.mdx

@@ -0,0 +1,28 @@
+---
+title: Hot reload an HTTP server
+sidebarTitle: Hot reload an HTTP server
+mode: center
+---
+
+Bun supports the [`--hot`](https://bun.com/docs/runtime/hot#hot-mode) flag to run a file with hot reloading enabled. When any module or file changes, Bun re-runs the file.
+
+```sh terminal icon="terminal"
+bun --hot run index.ts
+```
+
+---
+
+Bun detects when you are running an HTTP server with `Bun.serve()`. It reloads your fetch handler when source files change, _without_ restarting the `bun` process. This makes hot reloads nearly instantaneous.
+
+<Note>
+Note that this doesn't reload the page on your browser.
+</Note>
+ 
+```ts index.ts icon="/icons/typescript.svg"
+Bun.serve({
+  port: 3000,
+  fetch(req) {
+    return new Response("Hello world");
+  },
+});
+```