Remove link underlines from finder item headings

In long lists of links, underlines add a lot of visual clutter to headings, making them really hard to read, as they are here. 

This follows the example seen in [Search](https://www.gov.uk/search?q=tax), [Browse](https://www.gov.uk/browse/tax/income-tax), [Manuals](https://www.gov.uk/guidance/content-design), [Policies](https://www.gov.uk/government/policies) and many other lists where the link is implicit by its context.

![no_underlines](https://cloud.githubusercontent.com/assets/265403/4996404/47a039f2-69bf-11e4-85de-299b75de06a3.png)