Move to CRD style objects

[jamietanna]

Although we'd started with kebab-case, we'd discussed that a future version may/should use Kubernetes-style objects for better support

https://kubernetes.io/docs/concepts/overview/working-with-objects/kubernetes-objects/#describing-a-kubernetes-object

I.e. in use with Backstage

apiVersion: backstage.io/v1alpha1
kind: Component
metadata:
  name: artist-web
  description: The place to be, for great artists
  labels:
    example.com/custom: custom_label_value
  annotations:
    example.com/service-discovery: artistweb
    circleci.com/project-slug: github/example-org/artist-website
  tags:
    - java
  links:
    - url: https://admin.example-org.com
      title: Admin Dashboard
      icon: dashboard
spec:
  type: website
  lifecycle: production
  owner: artist-relations-team
  system: public-websites