Consolidate YAML files [part-8] (#9347)

* Consolidate YAML files [part-8]

This PR exacts the YAML files referenced from the following subdirs:

- docs/concepts/workloads
- docs/concepts/configuration
- docs/concepts/policy

The following problems are fixed:

- docs/concepts/workloads/controllers/ doesnt have a 'cronjob.yaml for
  test
- the exactly same `pod.yaml` was used in both the task/config-pod-container
  topic and the concepts/configuration topics.

* Update examples_test.go

* Add missing yaml file.

content/en/examples/controllers/replication.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: nginx
+spec:
+  replicas: 3
+  selector:
+    app: nginx
+  template:
+    metadata:
+      name: nginx
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx
+        ports:
+        - containerPort: 80