Added sorting to the posts (order by date, descending)

src/app/components/posts/posts.component.ts

@@ -89,6 +89,9 @@ export class PostsComponent implements OnInit, OnDestroy {
         // console.log('we should not display this');
       }
     }
+    // sort the posts
+    res.sort((p1, p2) => p2.created_timestamp.getMilliseconds() - p1.created_timestamp.getMilliseconds());
+
     this.filteredPosts = res;
   }