Fix broken search bar in docs site

[wren]

We previously didn't include the search results page in our CI testing, so we missed some issues on that page. This ensures that page is part of regular testing, and also includes fixes for the issues present.

Note: both our CI tests, and scane from a11y should pass on this PR.

Checklist

• I have read the contributing doc.
• I have included a link to the relevant issue number.
• I have tested this code locally.
• I have checked to ensure there aren't other open pull requests
  for the same issue.
• I have written new tests for these changes, as needed.
• All tests pass.

[micahellison]

🔍