Improve documentation for kubernetes ingress configuration

Co-authored-by: jbdoumenjou <jb.doumenjou@gmail.com>

docs/content/routing/providers/kubernetes-ingress.md

@@ -9,74 +9,184 @@ The provider then watches for incoming ingresses events, such as the example bel
 and derives the corresponding dynamic configuration from it,
 which in turn will create the resulting routers, services, handlers, etc.
 
-```yaml
+## Configuration Example
-kind: Ingress
-apiVersion: networking.k8s.io/v1beta1
-metadata:
-  name: foo
-  namespace: production
 
-spec:
+??? example "Configuring Kubernetes Ingress Controller"
+    
+    ```yaml tab="RBAC"
+    ---
+    kind: ClusterRole
+    apiVersion: rbac.authorization.k8s.io/v1beta1
+    metadata:
+      name: traefik-ingress-controller
     rules:
-  - host: foo.com
+      - apiGroups:
-    http:
+          - ""
-      paths:
+        resources:
-      - path: /bar
+          - services
-        backend:
+          - endpoints
-          serviceName: service1
+          - secrets
-          servicePort: 80
+        verbs:
-      - path: /foo
+          - get
-        backend:
+          - list
-          serviceName: service1
+          - watch
-          servicePort: 80
+      - apiGroups:
+          - extensions
+        resources:
+          - ingresses
+        verbs:
+          - get
+          - list
+          - watch
+      - apiGroups:
+          - extensions
+        resources:
+          - ingresses/status
+        verbs:
+          - update
     
-  tls:
+    ---
-  - secretName: mySecret
+    kind: ClusterRoleBinding
-```
+    apiVersion: rbac.authorization.k8s.io/v1beta1
-
+    metadata:
-### Annotations
+      name: traefik-ingress-controller
-
+    roleRef:
-??? example
+      apiGroup: rbac.authorization.k8s.io
+      kind: ClusterRole
+      name: traefik-ingress-controller
+    subjects:
+      - kind: ServiceAccount
+        name: traefik-ingress-controller
+        namespace: default
+    ```
     
     ```yaml tab="Ingress"
     kind: Ingress
     apiVersion: networking.k8s.io/v1beta1
     metadata:
-      name: foo
+      name: myingress
-      namespace: production
       annotations:
         traefik.ingress.kubernetes.io/router.entrypoints: web
     
     spec:
       rules:
-      - host: foo.com
+        - host: mydomain.com
           http:
             paths:
               - path: /bar
                 backend:
-              serviceName: service1
+                  serviceName: whoami
                   servicePort: 80
               - path: /foo
                 backend:
-              serviceName: service1
+                  serviceName: whoami
                   servicePort: 80
     ```
     
-    ```yaml tab="Service"
+    ```yaml tab="Traefik"
-    kind: Service
     apiVersion: v1
+    kind: ServiceAccount
     metadata:
-      name: service1
+      name: traefik-ingress-controller
-      namespace: testing
+    
-      annotations:
+    ---
-        traefik.ingress.kubernetes.io/service.passhostheader: "false"
+    kind: Deployment
+    apiVersion: apps/v1
+    metadata:
+      name: traefik
+      labels:
+        app: traefik
+    
+    spec:
+      replicas: 1
+      selector:
+        matchLabels:
+          app: traefik
+      template:
+        metadata:
+          labels:
+            app: traefik
+        spec:
+          serviceAccountName: traefik-ingress-controller
+          containers:
+            - name: traefik
+              image: traefik:v2.2
+              args:
+                - --log.level=DEBUG
+                - --api
+                - --api.insecure
+                - --entrypoints.web.address=:80
+                - --providers.kubernetesingress
+              ports:
+                - name: web
+                  containerPort: 80
+                - name: admin
+                  containerPort: 8080
+    
+    ---
+    apiVersion: v1
+    kind: Service
+    metadata:
+      name: traefik
+    spec:
+      type: LoadBalancer
+      selector:
+        app: traefik
+      ports:
+        - protocol: TCP
+          port: 80
+          name: web
+          targetPort: 80
+        - protocol: TCP
+          port: 8080
+          name: admin
+          targetPort: 8080
+    ```
+    
+    ```yaml tab="Whoami"
+    kind: Deployment
+    apiVersion: apps/v1
+    metadata:
+      name: whoami
+      labels:
+        app: containous
+        name: whoami
+    
+    spec:
+      replicas: 2
+      selector:
+        matchLabels:
+          app: containous
+          task: whoami
+      template:
+        metadata:
+          labels:
+            app: containous
+            task: whoami
+        spec:
+          containers:
+            - name: containouswhoami
+              image: containous/whoami
+              ports:
+                - containerPort: 80
+    
+    ---
+    apiVersion: v1
+    kind: Service
+    metadata:
+      name: whoami
     
     spec:
       ports:
-      - port: 80
+        - name: http
-      clusterIp: 10.0.0.1
+          port: 80
+      selector:
+        app: containous
+        task: whoami
     ```
 
+## Annotations
+
 #### On Ingress
 
 ??? info "`traefik.ingress.kubernetes.io/router.entrypoints`"