Add class for each filtered discussion's <a> tag on index discussions
Add class for each filtered discussion's <a> tag on index discussions

Most organizations change the link colors through custom CSS.
Since each discussion on the index is wrapped in an <a> tag,
all text would change to the link color, which doesn't look very
good. Now that the tag can be easily identified, link colors can
be changed using a:not(.discussion-link).

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