UI/UX: add footer

Author: Dokyeongyun

DBMonitoringDownloaderApp/src/main/resources/templates/index.html

@@ -125,5 +125,13 @@ <h2 class="text-left">Looking for a specific release?</h2>
         </div>
     </div>
 </div>
+<footer class="container">
+    <footer class="footer text-center">
+        <div class="container">
+            Copyright © 2021-2022 The Project DBMonitoring Author <a
+            href="https://github.com/dokyeongyun">Dokyeongyun</a>.
+        </div>
+    </footer>
+</footer>
 </body>
 </html>