Link news list item titles to news items

[erbridge]

Closes #243

Description

• We give news items a dark blue background for consistency with the expanded news item page and the rest of the site and because we have established styles for links on non-white backgrounds
• We link from the title of the news list item to the news item page

I decided not to hide one of the links from screen readers because there's a bunch of the news article text in the middle, making it valuable to have both links announced. They go to the same place, but have different link text, so we don't have the issue of repetitive links.

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