Docs: cleanup and add index (README.md).

docs/README.md

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+# big-AGI Documentation
+
+Welcome to the [official documentation for big-AGI](https://github.com/enricoros/big-AGI/blob/main/docs/README.md).
+Find all the information you need to get started, configure, and effectively use big-AGI.
+
+[//]: # (## Quick Start)
+
+[//]: # (- **[Introduction](big-agi.md)**: Overview of big-AGI's features.)
+
+## Configuration Guides
+
+Detailed guides to configure your big-AGI interface and models.
+
+👉 The following apply to users of [big-AGI.com](https://big-agi.com), as the public instance is empty and to be configured by the user.
+
+- **Cloud Model Services**:
+  - straightforward: **Anthropic**, **Google AI**, **Groq**, **Mistral**, **OpenAI**, **Perplexity**, **TogetherAI**
+  - **[Azure OpenAI](config-azure-openai.md)**
+  - **[OpenRouter](config-openrouter.md)**
+
+
+- **Local Model Servers**:
+  - **[LocalAI](config-local-localai.md)**
+  - **[LM Studio](config-local-lmstudio.md)**
+  - **[Ollama](config-local-ollama.md)**
+  - **[Oobabooga](config-local-oobabooga.md)**
+
+
+- **Advanced Feature Configuration**:
+  - **[Browse](config-feature-browse.md)**: Enable web page download through third-party services or your own cloud (advanced)
+  - **ElevenLabs API**: Voice and cutom voice generation, only requires their API key
+  - **Google Search API**: guide not yet available, see the Google options in [environment-variables.md](environment-variables.md) in the meantime
+  - **Prodia API**: Stable Diffusion XL image generation, only requires their API key, alternative to DALL·E
+
+## Deployment
+
+System integrators, administrators, whitelabelers: instead of using the public big-AGI instance on [get.big-agi.com](https://big-agi.com), you can deploy your own instance.
+
+Step-by-step deployment and system configuration instructions.
+
+- **Deploy Your Own**
+  - straightforward: **Local development**, **Vercel 1-Click**
+  - **[Cloudflare Deployment](deploy-cloudflare.md)**
+  - **[Docker Deployment](deploy-docker.md)**: Containers for Local or Cloud deployments
+
+
+- **Deployment Server Features**
+  - **[Database Setup](deploy-database.md)**: Optional, only required to enable "Chat Link Sharing"
+  - **[Environment Variables](environment-variables.md)**: 📌 Set server-side API keys and special features in your deployments
+  - **[HTTP Basic Authentication](deploy-authentication.md)**: Optional, Secure your big-AGI instance with a username and password
+
+## Customization & Derivative UIs
+
+👏 Customize big-AGI to fit your needs.
+
+- **[Customizing big-AGI](customizations.md)**: how to alter source code and server-side configuration
+
+<br/>
+
+## Support and Community
+
+Join our community or get support:
+
+- Visit our [GitHub repository](https://github.com/enricoros/big-AGI) for source code and issue tracking
+- Check the latest updates and features on [Changelog](changelog.md) or the in-app [News](https://get.big-agi.com/news)
+- Connect with us and other users on [Discord](https://discord.gg/your-invite-link) for discussions, help, and sharing your experiences with big-AGI
+
+Thank you for choosing big-AGI. We're excited to see what you'll build.