directory: show only recent groups in active/new tabs, page improvements (#6290)

* directory: show only recent groups as active or new

* round times

* sorting order

* fix links

* improve

website/src/directory.html

@@ -263,7 +263,7 @@ templateEngineOverride: njk
       <div id="top-pagination" class="pagination">
         <button class="text-btn live">Active</button>
         <button class="text-btn new">New</button>
-        <button class="text-btn top">Top</button>
+        <button class="text-btn top">All</button>
       </div>
     </div>
     <div id="directory" style="height: 3000px;"></div>