Add a WebRTC Audio Streaming Example in Python

[freddyaboulton]

This PR adds a new tutorial demonstrating how to use WebRTC for real-time audio streaming with ElevenLabs' speech-to-text and text-to-speech capabilities. The tutorial shows how to build a simple echo application that listens to user audio input and repeats it back in a different voice.

The application is entirely built in python and abstracts the underlying asyncio webrtc logic so it should be very easy for python developers and newcomers to get started.

[greptile-apps]

PR Summary

Added a comprehensive WebRTC tutorial demonstrating real-time audio streaming with ElevenLabs' speech-to-text and text-to-speech services, featuring a Python-based echo application.

• Added audio_to_bytes() helper function reference is missing in /fern/docs/pages/cookbooks/legacy/text-to-speech/webrtc.mdx
• Missing error handling section for WebRTC connection failures and audio processing errors
• Video demo source URL uses a user-specific GitHub attachment path that should be updated to a permanent CDN link
• Consider adding a note about WebRTC browser compatibility and requirements
• Should include memory/resource management best practices for long-running WebRTC connections

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