WIP: Resolve "Update README with troubleshooting and basic kube commands"

Closes #23 (closed)

Things to document

• use the alias kbc
• kbc get all
• kbc get pvc
• when to use kbc delete pod --all
• when to use kbc apply -f <manifest.yaml>
• kbc port-forward deployment/airflow-deployment 1234:8080
• kbc exec -ti <pod-name> -c <container_name> /bin/bash