chore: update footer

Author: Helias

src/app/components/footer/footer.component.html

@@ -1,3 +1,3 @@
-<footer class="px-4 py-6 text-center">
+<footer class="border-t border-(--border) px-4 py-6 text-center">
   <abbr title="Copyright">&copy;</abbr> {{ currentYear }} Python&nbsp;Catania
 </footer>