title: Show category list with new posts
body: <p>I would like to display a list of categories that have new posts in the past x days, without showing the names of posts and without duplicated category names in the list.</p>
  
  <p>For Example:
  1. Category B (new post)
  2. Category C (new post)
  3. Category F (new post)
  etc.</p>
  
  <p>Can someone please guide me on how to achieve this? I have absolutely no clue :)</p>