docs(code-of-conduct): redirect to official CNCF CoC
docs(code-of-conduct): redirect to official CNCF CoC

Rather than trying to keep this repo's code of conduct up to date with
the upstream, redirect like Kubernetes does to the official CoC.

flynnduism/helm,qwangrepos/helm,bacongobbler/helm,bacongobbler/helm,flynnduism/helm,adamreese/deployment-manager,adamreese/helm,yan234280533/helm,appscode/helm,michelleN/deployment-manager,rbwsam/helm,technosophos/deployment-manager,helm/helm,technosophos/deployment-manager,thomastaylor312/helm,helm/helm,michelleN/deployment-manager,bradj/helm,sushilkm/helm,iamzhout/helm,adamreese/deployment-manager,technosophos/k8s-helm,jascott1/helm,appscode/helm,adamreese/deployment-manager,kdada/helm,eicnix/helm,qwangrepos/helm,fibonacci1729/helm,FengyunPan/helm,adamreese/deployment-manager,rbwsam/helm,SlickNik/helm,adamreese/helm,bradj/helm,michelleN/deployment-manager,adamreese/deployment-manager,yan234280533/helm,technosophos/deployment-manager,FengyunPan/helm,jascott1/helm,iamzhout/helm,SlickNik/helm,eicnix/helm,kdada/helm,michelleN/deployment-manager,thomastaylor312/helm,technosophos/k8s-helm,technosophos/deployment-manager,technosophos/deployment-manager,sushilkm/helm,fibonacci1729/helm