fix(frontend): remove extraneous top margin from pagination controls

Remove the mt-5 class from the pagination container div to eliminate
unnecessary spacing between the pagination buttons and the per-page
selector.

frontend/src/helperComponents/Pagination.svelte

@@ -118,7 +118,7 @@
       </ul>
     </nav>
   {/if}
-  <div class="flex mt-5">
+  <div class="flex">
     <div class="w-20 mx-auto">
       <select
         bind:value={perPage}