Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.

content/cn/docs/tasks/inject-data-application/podpreset-proxy.yaml

@@ -0,0 +1,15 @@
+apiVersion: settings.k8s.io/v1alpha1
+kind: PodPreset
+metadata:
+  name: proxy
+  namespace: myns
+spec:
+  selector:
+    matchLabels:
+      role: frontend
+  volumeMounts:
+    - mountPath: /etc/proxy/configs
+      name: proxy-volume
+  volumes:
+    - name: proxy-volume
+      emptyDir: {}