Add ManualDocker.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-docker/ManualDocker.md

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+
+# Manual Docker Setup
+
+If you prefer to set up Docker manually, follow these steps.
+
+## Step 1: Pull the Open WebUI Image
+
+```bash
+docker pull ghcr.io/open-webui/open-webui:main
+```
+
+## Step 2: Run the Container
+
+```bash
+docker run -d -p 3000:8080 -v open-webui:/app/backend/data --name open-webui ghcr.io/open-webui/open-webui:main
+```
+
+**Note:** For Nvidia GPU support, add `--gpus all` to the `docker run` command.
+
+## Access the WebUI
+
+After the container is running, access Open WebUI at:
+
+[http://localhost:3000](http://localhost:3000)