feat: Add tutorial for Kokoro Web integration with Open WebUI for TTS capabilities

docs/tutorials/text-to-speech/kokoro-web-integration.md

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+---
+sidebar_position: 2
+title: "🗨️ Kokoro Web - Effortless TTS for Open WebUI"
+---
+
+:::warning
+This tutorial is a community contribution and is not supported by the Open WebUI team. It serves only as a demonstration on how to customize Open WebUI for your specific use case. Want to contribute? Check out the contributing tutorial.
+:::
+
+## What is `Kokoro Web`?
+
+[Kokoro Web](https://github.com/eduardolat/kokoro-web) provides a lightweight, OpenAI-compatible API for the powerful [Kokoro-82M](https://huggingface.co/hexgrad/Kokoro-82M) text-to-speech model, seamlessly integrating with Open WebUI to enhance your AI conversations with natural-sounding voices.
+
+## 🚀 Two-Step Integration
+
+### 1. Deploy Kokoro Web API (One Command)
+
+```yaml
+services:
+  kokoro-web:
+    image: ghcr.io/eduardolat/kokoro-web:latest
+    ports:
+      - "3000:3000"
+    environment:
+      # Change this to any secret key to use as your OpenAI compatible API key
+      - KW_SECRET_API_KEY=your-api-key
+    volumes:
+      - ./kokoro-cache:/kokoro/cache
+    restart: unless-stopped
+```
+
+Run with: `docker compose up -d`
+
+### 2. Connect OpenWebUI (30 Seconds)
+
+1. In OpenWebUI, go to `Admin Panel` → `Settings` → `Audio`
+2. Configure:
+   - Text-to-Speech Engine: `OpenAI`
+   - API Base URL: `http://localhost:3000/api/v1`  
+     (If using Docker: `http://host.docker.internal:3000/api/v1`)
+   - API Key: `your-api-key` (from step 1)
+   - TTS Model: `model_q8f16` (best balance of size/quality)
+   - TTS Voice: `af_heart` (default warm, natural english voice). You can change this to any other voice or formula from the [Kokoro Web Demo](https://voice-generator.pages.dev)
+
+**That's it! Your OpenWebUI now has AI voice capabilities.**
+
+## 🌍 Supported Languages
+
+Kokoro Web supports 8 languages with specific voices optimized for each:
+
+- English (US) - en-us
+- English (UK) - en-gb
+- Japanese - ja
+- Chinese - cmn
+- Spanish - es-419
+- Hindi - hi
+- Italian - it
+- Portuguese (Brazil) - pt-br
+
+Each language has dedicated voices for optimal pronunciation and natural flow. See the [GitHub repository](https://github.com/eduardolat/kokoro-web) for the complete list of language-specific voices or use the [Kokoro Web Demo](https://voice-generator.pages.dev) to preview and create your own custom voices instantly.
+
+## 💾 Optimized Models for Any Hardware
+
+Choose the model that fits your hardware needs:
+
+| Model ID | Optimization | Size | Ideal For |
+|----------|-------------|------|-----------|
+| model_q8f16 | Mixed precision | 86 MB | **Recommended** - Best balance |
+| model_quantized | 8-bit | 92.4 MB | Good CPU performance |
+| model_uint8f16 | Mixed precision | 114 MB | Better quality on mid-range CPUs |
+| model_q4f16 | 4-bit & fp16 weights | 154 MB | Higher quality, still efficient |
+| model_fp16 | fp16 | 163 MB | Premium quality |
+| model_uint8 | 8-bit & mixed | 177 MB | Balanced option |
+| model_q4 | 4-bit matmul | 305 MB | High quality option |
+| model | fp32 | 326 MB | Maximum quality (slower) |
+
+## ✨ Try Before You Install
+
+Visit the [**Kokoro Web Demo**](https://voice-generator.pages.dev) to preview all voices instantly. This demo:
+
+- **Runs 100% in your browser** - No server required
+- **Free forever** - No usage limits or registration needed
+- **Zero installation** - Just visit the website and start creating
+- **All features included** - Test any voice or language immediately
+
+## Need More Help?
+
+For additional options, voice customization guides, and advanced settings, visit the [GitHub repository](https://github.com/eduardolat/kokoro-web).
+
+**Enjoy natural AI voices in your OpenWebUI conversations!**