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/tutorials/k8s201.md

@@ -65,7 +65,7 @@ A Deployment object defines a Pod creation template (a "cookie-cutter" if you wi
 
 Here is a Deployment that instantiates two nginx Pods:
 
-{{< code file="deployment.yaml" >}}
+{{< codenew file="application/deployment.yaml" >}}
 
 
 ### Deployment Management
@@ -73,7 +73,7 @@ Here is a Deployment that instantiates two nginx Pods:
 Create an nginx Deployment:
 
 ```shell
-kubectl create -f https://k8s.io/docs/tutorials/deployment.yaml
+kubectl create -f https://k8s.io/examples/application/deployment.yaml
 ```
 
 List all Deployments:
@@ -91,10 +91,10 @@ kubectl get pods -l app=nginx
 Upgrade the nginx container from 1.7.9 to 1.8 by changing the Deployment and calling `apply`.  The following config
 contains the desired changes:
 
-{{< code file="deployment-update.yaml" >}}
+{{< codenew file="application/deployment-update.yaml" >}}
 
 ```shell
-kubectl apply -f https://k8s.io/docs/tutorials/deployment-update.yaml
+kubectl apply -f https://k8s.io/examples/application/deployment-update.yaml
 ```
 
 Watch the Deployment create Pods with new names and delete the old Pods: