lenses chart: Improve Ingress TLS settings: cert-manager support / secret name

[mjungsbluth]

The secret name for ingress tls configuration is derived from the release name, this should really be configurable to be called "lenses-tls-certificate" or whatever naming convention you follow.

The tls section should also contain the hostname s.t. cert-manager can automatically provision let's encrypt certificates if installed.

I will provide a PR...