Css class additions (PR #10532)

These additions address issues brought up here by UIPath.

  1. Currently pinned is added to a pinned topic on the Latest view, but not on the Category view. This change adds that functionality to the category page as well.
  2. The second additions adds the tag name as a class to the tag for easier CSS manipulation. Currently the only way to target specific tags by name is by using the “data-name” attribute. If this is how we would rather continue doing it, we can disregard this addition.