fix(all): allow server side rendering for all packages

[austingreendev]

Description

While adding a GatsbyJS example I found that some of our refactored components, including the new focus-visible utility, aren't rendering correctly in SSR environments.

Along with zendeskgarden/react-containers#163 this PR creates a new useDocument hook in the react-theming package which allows consuming packages to receive a themed Document in a SSR compatible way.

It also migrates all direct document usage (outside of a useEffect) to the useDocument hook across the packages.

We should deploy zendeskgarden/react-containers#163 and upgrade the affected dependencies before merging this PR.

Unrelated

I've also added https://www.npmjs.com/package/@testing-library/react-hook to help test hooks directly.

Checklist

• 👌 design updates are Garden Designer approved (add the
  designer as a reviewer)
• 🌐 Styleguidist demo is up-to-date (yarn start)
• ⬅️ renders as expected with reversed (RTL) direction
• ♿ analyzed via axe and evaluated using VoiceOver
• 💂‍♂️ includes new unit tests
• 📝 tested in Chrome, Firefox, Safari, Edge, and IE11

[coveralls]

Coverage decreased (-0.02%) to 98.033% when pulling 4061201 on agreen/update-examples into 99d33d1 on master.

[jzempel]

Looks good. Plz hold merge for TBD menuStyles added to react-theming PR.