chore: remove legacy clusterissuer manifests

cert-manager/cluster-issuer-selfsigned.yaml

@@ -1,6 +0,0 @@
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: cluster-issuer-selfsigned
-spec:
-  selfSigned: {}

cert-manager/issuer-production.yml

@@ -1,16 +0,0 @@
-# Legacy issuer that is not managed by Kustomize.
-# For new certificates, prefer prod/clusterissuer.yaml.
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-production
-spec:
-  acme:
-    server: https://acme-v02.api.letsencrypt.org/directory
-    email: postmaster@netflux.io
-    privateKeySecretRef:
-      name: letsencrypt-production
-    solvers:
-    - http01:
-        ingress:
-          class: nginx

cert-manager/issuer-staging.yml

@@ -1,16 +0,0 @@
-# Legacy issuer that is not managed by Kustomize.
-# For new certificates, add staging/clusterissuer.yaml.
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-staging
-spec:
-  acme:
-    server: https://acme-staging-v02.api.letsencrypt.org/directory
-    email: postmaster@netflux.io
-    privateKeySecretRef:
-      name: letsencrypt-staging
-    solvers:
-      - http01:
-          ingress:
-            class: nginx