Update the simple-chatbot demo to have JS and React clients

examples/simple-chatbot/server/README.md

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+# Simple Chatbot Server
+
+A FastAPI server that manages bot instances and provides endpoints for both Daily Prebuilt and RTVI client connections.
+
+## Endpoints
+
+- `GET /` - Direct browser access, redirects to a Daily Prebuilt room
+- `POST /connect` - RTVI client connection endpoint
+- `GET /status/{pid}` - Get status of a specific bot process
+
+## Environment Variables
+
+Copy `env.example` to `.env` and configure:
+
+```ini
+DAILY_API_KEY=           # Your Daily API key
+DAILY_API_URL=           # Optional: Daily API URL (defaults to https://api.daily.co/v1)
+OPENAI_API_KEY=          # Your OpenAI API key
+CARTESIA_API_KEY=        # Your Cartesia API key
+HOST=                    # Optional: Host address (defaults to 0.0.0.0)
+FAST_API_PORT=           # Optional: Port number (defaults to 7860)
+```
+
+## Running the Server
+
+Set up and activate your virtual environment:
+
+```bash
+python3 -m venv venv
+source venv/bin/activate  # On Windows: venv\Scripts\activate
+```
+
+Install dependencies:
+
+```bash
+pip install -r requirements.txt
+```
+
+Run the server:
+
+```bash
+python server.py
+```