Redirect Usability Test Quality

[jstrothman]

Background A search for usability test includes this result: https://ux-guide.18f.gov/_pages/resources/usability-test-quality.html which is a page that doesn't use the template. Let's redirect it to https://github.com/18F/ux-guide/blob/master/_pages/resources/usability-test-quality-heuristics.md (see the redirect metadata on/_pages/resources/usability-test-quality-heuristics.md)

Acceptance criteria

• [ ] https://ux-guide.18f.gov/_pages/resources/usability-test-quality.html redirects to https://github.com/18F/ux-guide/blob/master/_pages/resources/usability-test-quality-heuristics.md

Definition of done

• [ ] One of the POs has approved the change