Remove Certificate step from SSL page?

[alexellis]

Proposed change

We may be able to remove the additional create Certificate step from SSL page.. https://docs.openfaas.com/reference/ssl/kubernetes-with-cert-manager/

Context

It seems like cert-manager's Ingress shim (available since 0.2.2) automatically creates certificates if an Ingress object is decorated appropriately. This is simpler than us instructing the user to create a separate Certificate object.

Found by: @ajaegle

openfaas/ingress-operator#6

Your Environment

We should test that the certificate is created automatically before removing the explicit step.

[LucasRoesler]

I think we should remove it, but make sure to add a callout in the docs that this only "works for cert-manager 0.2.2+ when ingress-shim is installed, the default configuration." Or some other similar wording.

[alexellis]

Whilst I appreciate the caution, we currently tell people to use cert-manager is at 0.7.0, so I don't think the notice is needed (for that reason).