fix: update README.md for installtion add Dockerfile version and labels

Signed-off-by: Kevin Klopfenstein <kk@sudo-i.net>

Author: chifu1234

README.md

@@ -44,7 +44,12 @@ spec:
       initContainers:
         - name: install-capsule-plugin
           image: ghcr.io/projectcapsule/headlamp-plugin:vX.Y.Z
-          command: ['cp', '-r', '/plugins/capsule', '/plugins']
+          command: ['/bin/cp', '-r', '/plugins/capsule', '/target/plugins']
+          volumeMounts:
+            - name: plugins
+              mountPath: /target/plugins
+      containers:
+        - name: headlamp
           volumeMounts:
             - name: plugins
               mountPath: /plugins
@@ -60,7 +65,6 @@ spec:
 
 #### Using an image volume (Kubernetes 1.31+)
 
-Build the image from the repo `Dockerfile`, push it to your registry, then mount it directly using the native Kubernetes image volume feature (no initContainer needed):
 
 ```yaml
 spec:
@@ -74,7 +78,7 @@ spec:
       volumes:
         - name: plugins
           image:
-            reference: your-registry/capsule-plugin:vX.Y.Z
+            reference: ghcr.io/projectcapsule/headlamp-plugin:vX.Y.Z
             pullPolicy: IfNotPresent
 ```