Update LiveKit Demo URL (#3897)

- ref. https://github.com/awesome-selfhosted/awesome-selfhosted/issues/3558
- https://livekit.io/playground : HTTP 404
Co-authored-by: Rabenherz112 <rabenherz@theravenhub.com>

README.md

@@ -594,7 +594,7 @@ _Related: [Conference Management](#conference-management)_
 - [Galene](https://galene.org/) - Galène (or Galene) is a videoconference server (an “SFU”) that is easy to deploy and that requires moderate server resources. ([Source Code](https://github.com/jech/galene)) `MIT` `Go`
 - [Jitsi Meet](https://jitsi.org/Projects/JitsiMeet) - Jitsi Meet is an OpenSource (MIT) WebRTC Javascript application that uses Jitsi Videobridge to provide high quality, scalable video conferences. ([Source Code](https://github.com/jitsi/jitsi-meet)) `Apache-2.0` `Nodejs/Docker`
 - [Jitsi Video Bridge](https://jitsi.org/Projects/JitsiVideobridge) - WebRTC compatible Selective Forwarding Unit (SFU) that allows for multiuser video communication. ([Source Code](https://github.com/jitsi/jitsi-videobridge)) `Apache-2.0` `Java`
-- [LiveKit](https://livekit.io/) - Modern, scalable WebRTC conferencing platform with client SDKs. ([Demo](https://livekit.io/playground), [Source Code](https://github.com/livekit/livekit-server)) `Apache-2.0` `Go`
+- [LiveKit](https://livekit.io/) - Modern, scalable WebRTC conferencing platform with client SDKs. ([Demo](https://github.com/livekit/livekit#live-demos), [Source Code](https://github.com/livekit/livekit-server)) `Apache-2.0` `Go`
 - [MiroTalk C2C](https://c2c.mirotalk.com) - Real-time cam-2-cam video calls & screen sharing, end-to-end encrypted, to embed in any website with a simple iframe. ([Source Code](https://github.com/miroslavpejic85/mirotalkc2c)) `MIT` `Nodejs/Docker`
 - [MiroTalk P2P](https://p2p.mirotalk.com) - Simple, secure, fast real-time video conferences up to 4k and 60fps, compatible with all browsers and platforms. ([Demo](https://p2p.mirotalk.com/newcall), [Source Code](https://github.com/miroslavpejic85/mirotalk)) `AGPL-3.0` `Nodejs/Docker`
 - [MiroTalk SFU](https://sfu.mirotalk.com) - Simple, secure, scalable real-time video conferences up to 4k, compatible with all browsers and platforms. ([Demo](https://sfu.mirotalk.com/newroom), [Source Code](https://github.com/miroslavpejic85/mirotalksfu)) `AGPL-3.0` `Nodejs/Docker`