docs: refactor and improve documentation across multiple files

- Streamline and enhance documentation for API, architecture, getting started, and usage
- Improve clarity, readability, and organization of documentation files
- Update content to be more concise and informative
- Ensure consistent formatting and style across documentation

docs/usage.md

@@ -1,5 +1,34 @@
 # Usage Guide
 
+This guide explains how to use the Home Assistant MCP Server for smart home device management and integration with language learning systems.
+
 ## Basic Usage
 
-## Advanced Features 
+1. **Starting the Server:**
+   - For development: run `npm run dev`.
+   - For production: run `npm run build` followed by `npm start`.
+
+2. **Accessing the Web Interface:**
+   - Open [http://localhost:3000](http://localhost:3000) in your browser.
+
+3. **Real-Time Updates:**
+   - Connect to the SSE endpoint at `/subscribe_events?token=YOUR_TOKEN&domain=light` to receive live updates.
+
+## Advanced Features
+
+1. **API Interactions:**
+   - Use the REST API for operations such as device control, automation, and add-on management.
+   - See [API Documentation](api.md) for details.
+
+2. **Tool Integrations:**
+   - Multiple tools are available (see [Tools Documentation](tools/README.md)), for tasks like automation management and notifications.
+
+3. **Security Settings:**
+   - Configure token-based authentication and environment variables as per the [Configuration Guide](getting-started/configuration.md).
+
+4. **Customization and Extensions:**
+   - Extend server functionality by developing new tools as outlined in the [Development Guide](development/README.md).
+
+## Troubleshooting
+
+If you experience issues, review the [Troubleshooting Guide](troubleshooting.md).