feat: break out crds into separate fluxcd/Kustomization

cluster/core/cert-manager/crd/kustomization.yaml

@@ -1,5 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-resources:
-# renovate: registryUrl=https://charts.jetstack.io chart=cert-manager
-- https://github.com/jetstack/cert-manager/releases/download/v1.3.1/cert-manager.crds.yaml

cluster/core/cert-manager/kustomization.yaml

@@ -1,7 +1,6 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-- crd
 - helm-release.yaml
 - letsencrypt-production.yaml
 - letsencrypt-staging.yaml