[NODE] Add Text to Speech documentation

[ShambaC]

Node Config

{
    title: "Text to Speech",
    category: "audio",
    type: "text_to_speech",
    icon: {},
    desc: "Convert text to speech using Eleven Labs",
    credit: 100,
    inputs: [
        {
            desc: "The Flow to trigger",
            name: "Flow",
            type: "Flow",
        },
        {
            desc: "Text to generate speech for",
            name: "Content",
            type: "Text",
        },
        {
            desc: "Specific voice ID to use (will override the above option)",
            name: "VoiceID",
            type: "Text",
        },
        {
            desc: "Emotional setting of the voice (lower is more emotional)",
            name: "Emotion",
            type: "Number",
        },
        {
            desc: "Speed of the generated speech",
            name: "Speed",
            type: "Number",
        },
    ],
    outputs: [
        {
            desc: "Generated audio",
            name: "Audio Link",
            type: "Text",
        },
    ],
    fields: [
        {
            desc: "Text to generate speech for",
            name: "Content",
            type: "TextArea",
            value: "Text here ...",
        },
        {
            desc: "Voice model to use",
            name: "Voice",
            type: "select",
            value: "George (warm resonance)",
            options: [
                "Aria (middle aged female calm)",
                "Sarah (young adult woman confident)",
                "Laura (young adult female sunny)",
                "Charlie (young aussie male confident)",
                "George (warm resonance)",
                "Callum (gravelly edgy)",
            ],
        },
        {
            desc: "Specific voice ID to use (will override the above option)",
            name: "VoiceID",
            type: "Text",
            value: "ID here ...",
        },
        {
            desc: "Emotional setting of the voice (lower is more emotional)",
            name: "Emotion",
            type: "Slider",
            value: 0.5,
            min: 0.0,
            max: 1.0,
            step: 0.1,
        },
        {
            desc: "Speed of the generated speech",
            name: "Speed",
            type: "Slider",
            value: 1.0,
            min: 0,
            max: 2.0,
            step: 0.1,
        },
        {
            desc: "Model to use for speech generation",
            name: "Model",
            type: "select",
            value: "eleven_multilingual_v2",
            options: [
                "eleven_multilingual_v2",
                "eleven_v3",
                "eleven_flash_v2_5",
                "eleven_turbo_v2_5",
            ],
        },
    ],
    difficulty: "easy",
    tags: ["TTS", "audio", "elevenlabs"],
}

Additional Information

Long Description:
Convert your text to speech using AI

Use Cases:

• Add voiceover to your videos without actually speaking
• Create an agent which can reply with voice
• Create an audiobook agent

[github-actions]

✅ Documentation processed successfully!

A pull request has been created: #28

The node documentation will be reviewed and merged if everything looks correct.