Remove header from OpenAI Realtime API documentation

Removed the header from the Realtime API documentation.

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

Author: mudler

docs/content/features/openai-realtime.md

@@ -4,8 +4,6 @@ title: "Realtime API"
 weight: 60
 ---
 
-# Realtime API
-
 LocalAI supports the [OpenAI Realtime API](https://platform.openai.com/docs/guides/realtime) which enables low-latency, multi-modal conversations (voice and text) over WebSocket.
 
 To use the Realtime API, you need to configure a pipeline model that defines the components for Voice Activity Detection (VAD), Transcription (STT), Language Model (LLM), and Text-to-Speech (TTS).