docs: automate icon usage

[ArtBlue]

As icons are renamed or removed by DS, the icons used throughout the docs can go missing. Without adequate manual checks after icons work, the docs can look broken.

For this issue, create a docs component to use a random available icon to use in docs.

[agliga]

One thing we can do is to have tests to run our site and make sure there are no console.errors when we load the site. This is probably important even moreso now that we have separate pages and routes.
If an icon is missing, we can easily add a console.error so we can see if there are problems.