Text card widget hover effect

[kevindherman]

@curtismchale sorry for catching these items after testing #2697. Here are hover effect adjustments:

• card title (h3) needs to change from black to white like text description does when hovering
• Underline should also be white with hover effect
• Underline should only be on card title (h3) and not all text if possible during hover effect. This is a lower priority than the two above.

cc @rebeccawoodbury

[curtismchale]

@kevindherman the fixes for this and #2706 are on all staging site and going live in a bit.

[kevindherman]

@curtismchale looks great.