Merge branch 'topleveldeploy' into 'master'

Topleveldeploy

Creating a top-level kustomize base for use in Customers/bigbang environment template.  This base controls the kustomization of the flux resources for the umbrella chart with default values.  Overrides are provided through Kustomization in the environment template which reference this.

In addition, examples has been removed, in favor of the Customers/bigbang template.  All of the example's settings are in the template with exception of authservice and ingress-cert.  Those were moved to hack/secrets.yaml along with the private key for decrypting.

Documentation was updated to reflect the split of the example/template and the chart/kustomize for umbrella.

See merge request platform-one/big-bang/umbrella!76