Remove nginx-alpha, examples and simplify read files

controllers/nginx/examples/default-backend.yaml

@@ -1,36 +0,0 @@
-apiVersion: v1
-kind: ReplicationController
-metadata:
-  name: default-http-backend
-spec:
-  replicas: 1
-  selector:
-    app: default-http-backend
-  template:
-    metadata:
-      labels:
-        app: default-http-backend
-    spec:
-      terminationGracePeriodSeconds: 60
-      containers:
-      - name: default-http-backend
-        # Any image is permissable as long as:
-        # 1. It serves a 404 page at /
-        # 2. It serves 200 on a /healthz endpoint
-        image: gcr.io/google_containers/defaultbackend:1.0
-        livenessProbe:
-          httpGet:
-            path: /healthz
-            port: 8080
-            scheme: HTTP
-          initialDelaySeconds: 30
-          timeoutSeconds: 5
-        ports:
-        - containerPort: 8080
-        resources:
-          limits:
-            cpu: 10m
-            memory: 20Mi
-          requests:
-            cpu: 10m
-            memory: 20Mi