Add Helm.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-kubernetes/Helm.md

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+
+# Helm Setup for Kubernetes
+
+Helm helps you manage Kubernetes applications.
+
+## Prerequisites
+
+- Kubernetes cluster is set up.
+- Helm is installed.
+
+## Steps
+
+1. **Add Open WebUI Helm Repository:**
+
+   ```bash
+   helm repo add open-webui https://open-webui.github.io/helm-charts
+   helm repo update
+   ```
+
+2. **Install Open WebUI Chart:**
+
+   ```bash
+   helm install openwebui open-webui/open-webui
+   ```
+
+3. **Verify Installation:**
+
+   ```bash
+   kubectl get pods
+   ```
+
+## Access the WebUI
+
+Set up port forwarding or load balancing to access Open WebUI from outside the cluster.