Consolidate YAML files [part-2] (#9236)

Changes that will help upcoming consolidation work:

- Add variable `githubWebsiteRaw` to config.toml to facilitate building
  links to raw YAML files
- Revise `codenew` shortcode to generate links to raw YAML files instead
  of github.com file view;
- Rename `artifacts` directory to `examples` to better reflect its usage;

Accompanied changes as show cases:

- Moved `deployment.yaml`, `deployment-update.yaml` and
  `deployment-scale.yaml` to the new `examples/application` subdirectory;
- Removed duplicate instances of the above YAML files in other
  directories;
- Update example_test.go to test the relocated YAML files and removed
  testing for files that no longer needed.

content/en/docs/tasks/run-application/deployment-scale.yaml

@@ -1,19 +0,0 @@
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
-kind: Deployment
-metadata:
-  name: nginx-deployment
-spec:
-  selector:
-    matchLabels:
-      app: nginx
-  replicas: 4 # Update the replicas from 2 to 4
-  template:
-    metadata:
-      labels:
-        app: nginx
-    spec:
-      containers:
-      - name: nginx
-        image: nginx:1.8
-        ports:
-        - containerPort: 80

content/en/docs/tasks/run-application/deployment-update.yaml

@@ -1,19 +0,0 @@
-apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
-kind: Deployment
-metadata:
-  name: nginx-deployment
-spec:
-  selector:
-    matchLabels:
-      app: nginx
-  replicas: 2
-  template:
-    metadata:
-      labels:
-        app: nginx
-    spec:
-      containers:
-      - name: nginx
-        image: nginx:1.8 # Update the version of nginx from 1.7.9 to 1.8
-        ports:
-        - containerPort: 80

content/en/docs/tasks/run-application/run-stateless-application-deployment.md

@@ -41,7 +41,7 @@ a Deployment that runs the nginx:1.7.9 Docker image:
 
 1. Create a Deployment based on the YAML file:
 
-        kubectl apply -f https://k8s.io/docs/artifacts/application/deployment.yaml
+        kubectl apply -f https://k8s.io/examples/application/deployment.yaml
 
 1. Display information about the Deployment:
 
@@ -99,11 +99,11 @@ a Deployment that runs the nginx:1.7.9 Docker image:
 You can update the deployment by applying a new YAML file. This YAML file
 specifies that the deployment should be updated to use nginx 1.8.
 
-{{< code file="deployment-update.yaml" >}}
+{{< codenew file="application/deployment-update.yaml" >}}
 
 1. Apply the new YAML file:
 
-         kubectl apply -f https://k8s.io/docs/tasks/run-application/deployment-update.yaml
+         kubectl apply -f https://k8s.io/examples/application/deployment-update.yaml
 
 1. Watch the deployment create pods with new names and delete the old pods:
 
@@ -115,11 +115,11 @@ You can increase the number of pods in your Deployment by applying a new YAML
 file. This YAML file sets `replicas` to 4, which specifies that the Deployment
 should have four pods:
 
-{{< code file="deployment-scale.yaml" >}}
+{{< codenew file="application/deployment-scale.yaml" >}}
 
 1. Apply the new YAML file:
 
-        kubectl apply -f https://k8s.io/docs/tasks/run-application/deployment-scale.yaml
+        kubectl apply -f https://k8s.io/examples/application/deployment-scale.yaml
 
 1. Verify that the Deployment has four pods: