Hover underline/color for links with icons

[dbranchini]

@dnoneill and I talked about this, and it might not be easy to fix, but I thought I'd at least document it. Ideally, the text links with preceding icons should do the following on hover: underline the text (not the icons too -- see examples below), and both the icon and text should change from Digital blue #006CB8 to Digital blue Dark #00548f. Email looks correct in the examples below.