#8245 Update demo CSS

[cogwurx]

Added new hover states on demo for the navmenu and search results
Darkened the text link hover state for better readability

[jquerybot]

Thank you for your pull request. It looks like this may be your first contribution to a jQuery Foundation project, if so we need you to sign our Contributor License Agreement (CLA).

📝 Please visit http://contribute.jquery.org/CLA/ to sign.

After you signed, the PR is checked again automatically after a minute. If there's still an issue, please reply here to let us know.

---

If you've already signed our CLA, it's possible your git author information doesn't match your CLA signature (both your name and email have to match), for more information, check the status of your CLA check.

[jaspermdegroot]

@cogwurx will create a new PR using the right branch. Closing.