Deprecate the acme chart

[dduportal]

Since the version v1.15.0 of cert-manager chart, there is a new feature which allows to create "additional" objects through valuespassed to cert-manager: cert-manager/cert-manager#6424

Using this feature would allow us to deprecate theacme chart which goal is to create 2 additional objects: a Secret and a ClusterIssuer object. Removing the chart would mean simplifying our setup in https://github.com/jenkins-infra/kubernetes-management/blob/e4f3eb68251045aaa66e3c4a915d5ebb8baa737c/clusters/publick8s.yaml#L39-L55 and maintain less code.