Narration with the ElevenLabs text-to-speech API.
config :phx_demo, :tts, {PhxDemo.TTS.ElevenLabs, voice_id: "21m00Tcm4TlvDq8ikWAM"}Options:
:api_key: defaults to theELEVENLABS_API_KEYenvironment variable:voice_id: default"21m00Tcm4TlvDq8ikWAM"(Rachel):model_id: default"eleven_multilingual_v2":output_format: default"mp3_44100_128":base_url: default"https://api.elevenlabs.io/v1"