Remove non-working vault manifest

docs/vault-example.yaml

@@ -1,31 +0,0 @@
-# NOTE: These resources do not currently work and hare just here as a vision
-# of how vault may be supported
-apiVersion: certmanager.k8s.io/v1alpha1
-kind: Certificate
-metadata:
-  name: facebook-crt
-spec:
-  secret: facebook-crt
-  issuer: vault-staging
-  domains:
-  - www.facebook.com
-  - facebook.com
-status:
-  state: Ready
----
-# vault issuer resource
-apiVersion: certmanager.k8s.io/v1alpha1
-kind: Issuer
-metadata:
-  name: vault-staging
-spec:
-  vault:
-    url: https://vault.vault.svc.cluster.local
-    path: pki/prod-ca/
-    role: http-server
-    auth:
-      token:
-        secretName: vault-staging-token
-status:
-  ready: true
----