Kubernetes API - Connection between kubectl commands, K8s REST API and declarative YAML/JSON format

[javaplus]

Make updates to the slide deck to explain the K8s API Server and the connection to the kubectl CLI.

• Add visual of K8s API Server
• Slide to demonstrate the common usage pattern of kubectl <verb> <noun>
• Slide to visualize the connection between the declarative YAML/JSON and the API resource URL's

[frayer]

Added a new section to the deck explaining the API Server