Updated footer for 2023

Author: iebecker

themes/templates/components/footer.html

@@ -1,6 +1,6 @@
 <footer class="footer">
   <div class="container">
-    <span class="text-muted">Copyright 2022 &copy;
+    <span class="text-muted">Copyright 2023 &copy;
       <a class="text-muted" href="https://iacs.seas.harvard.edu/">Institute for Applied Computational Science</a>
     </span>
   </div>