Add Venv.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-python/Venv.md

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+
+# Using Virtual Environments
+
+Create isolated Python environments using `venv`.
+
+## Steps
+
+1. **Create a Virtual Environment:**
+
+   ```bash
+   python3 -m venv venv
+   ```
+
+2. **Activate the Virtual Environment:**
+
+   - On Linux/macOS:
+
+     ```bash
+     source venv/bin/activate
+     ```
+
+   - On Windows:
+
+     ```bash
+     venv\Scripts\activate
+     ```
+
+3. **Install Open WebUI:**
+
+   ```bash
+   pip install open-webui
+   ```
+
+4. **Start the Server:**
+
+   ```bash
+   open-webui serve
+   ```