docs: move realtime SFU docs into subfolder

Author: roerohan

src/content/docs/realtime/index.mdx

@@ -31,4 +31,4 @@ Cloudflare Realtime runs on [Cloudflare's global cloud network](https://www.clou
 </LinkButton>
 <LinkButton variant="secondary" href="https://github.com/cloudflare/orange">
 	Orange Meets demo app
-</LinkButton>
+</LinkButton>

src/content/docs/realtime/calls-vs-sfus.mdx renamed to src/content/docs/realtime/sfu/calls-vs-sfus.mdx

@@ -0,0 +1,34 @@
+---
+title: Realtime SFU
+pcx_content_type: overview
+sidebar:
+  order: 1
+head:
+  - tag: title
+    content: Overview
+---
+
+import { Description, LinkButton } from "~/components";
+
+<Description>
+
+Build real-time serverless video, audio and data applications.
+
+</Description>
+
+Cloudflare Realtime is infrastructure for real-time audio/video/data applications. It allows you to build real-time apps without worrying about scaling or regions. It can act as a selective forwarding unit (WebRTC SFU), as a fanout delivery system for broadcasting (WebRTC CDN) or anything in between.
+
+Cloudflare Realtime runs on [Cloudflare's global cloud network](https://www.cloudflare.com/network/) in hundreds of cities worldwide.
+
+<LinkButton variant="primary" href="/realtime/get-started/">
+	Get started
+</LinkButton>
+<LinkButton
+	variant="secondary"
+	href="https://dash.cloudflare.com/?to=/:account/calls"
+>
+	Realtime dashboard
+</LinkButton>
+<LinkButton variant="secondary" href="https://github.com/cloudflare/orange">
+	Orange Meets demo app
+</LinkButton>