Livy 984 (#410)

LIVY-984 - Update Copyrights in NOTICE and footer

Author: lmccay

NOTICE

@@ -1,5 +1,5 @@
 Apache Livy
-Copyright 2018 and onwards The Apache Software Foundation
+Copyright 2018-2023 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

docs/_includes/themes/apache/footer.html

@@ -19,7 +19,7 @@
                 </div>
                 {% endif %}
                 <div>
-                    Copyright &copy; 2017 <a href="http://www.apache.org">The Apache Software Foundation</a>.
+                    Copyright &copy; 2017-2023 <a href="http://www.apache.org">The Apache Software Foundation</a>.
                     Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version
                     2.0</a>.
                     <br>