Feature Request: Let's Encrypt Certificates

[cainelli]

I'm opening this issue for discussion of how we should implement support for automated creation, deploy and renew of let's encrypt certificates.

Some related projects which we may find inspiration:

https://github.com/jetstack/kube-lego
https://github.com/kelseyhightower/kube-cert-manager

[OR13]

Also https://github.com/appscode/voyager/blob/master/docs/guides/certificate/faq.md

[cainelli]

Hey @OR13, we deprecated this project since Kong has an official ingress controller now.