"Mixed insecure content" warning from netlify

[ahmetb]

Just got this email, pointing to https://app.netlify.com/sites/kubernetes-io-master-staging/deploys/5b5faeb573f2cf5636fa29fd have been getting them a few more times over the past week.

5:35:36 PM: Starting to deploy site from 'public'
5:35:40 PM: Starting post processing
5:35:52 PM: Mixed content detected in: /docs/setup/on-premises-vm/ovirt/index.html
5:35:53 PM: Mixed content detected in: /docs/setup/turnkey/gce/index.html