Make site-wide link style only apply to actual links.

This should fix the issue with href-less links, so you can turn the cross-referencing back on.

Also note that I pushed a few no-op CSS changes to master earlier in order to unify the whitespace in the CSS file.

Let me know if you see any fallout from any of this. (Note that I still support the merger of #47 for #1, though I haven't taken a direct look at it lately.)