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.
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