Mender.io sometimes misrendered due to missing CSS file

It is believed that the issue is the same as, or at least related to, the issue in Mender Docs, where the CSS file is missing on the first fetch after a rebuild. It's possible that Grav rebuilds this during normal operations also, not just during redeployment.

Since these rebuilds are difficult to predict, it's hard to reproduce the issue reliably, and some research is required here.