It links to install.yaml instead of install.md: https://github.com/kubernetes/helm/blob/master/docs/install.md

This documents an issue reported in Slack that turned out to be related
to security configuration in Kubernetes.

Closes #1630

Downloading of charts and helm itself happened over http. This
change moves to use https as that is available with valid certs.

A bucket name in the path can be migrated to a custom k8s domain
name. This is in preperation for that.

The solution to #1455 is to configure dnsmasq on each of your nodes.
This adds brief documentation on how to do so.

Closes #1455