Fixes ClusterIssuer config

gitops-kaisers-info/templates/letsencrypt.yaml

-apiVersion: cert-manager.io/v1alpha2
+apiVersion: cert-manager.io/v1
 kind: ClusterIssuer
 metadata:
   name: letsencrypt-prod
   acme:
     email: simon.kaiser@gmx.net # replace this
     privateKeySecretRef:
-      name: issuer-account-key
+      name: prod-issuer-account-key
     server: https://acme-v02.api.letsencrypt.org/directory
-    http01: {}
     solvers:
       - http01:
           ingress: