Move static content to static

Jekyll has a rule that any directory not starting with _ will be copied as-is to the _site output. Hugo keeps all static content under static. You should therefore move it all there.
With Jekyll, something that looked like

▾ <root>/
    ▾ images/...

Step 1. Install Hugo

Go to Hugo releases and download the
appropriate version for your OS and architecture.

Save it somewhere specific as we will be using it in the next step.

More complete instructions are available at [Install Hugo](https://gohugo.io...