Update frontpage message

Author: root

codalab/apps/web/templates/web/index.html

@@ -24,8 +24,8 @@
             <div class="col-md-10">
                 <div style="margin-top: 15px;" class="well">
                     <p>Dear Codalab users,</p>
-                    <p style='color:red'><b>
-                        A maintenance operation is planned on the 23rd of July 2021. Thank you for your comprehension.
+                    <p style='color:green'><b>
+                        We are currently upgrading the platform. The upgraded version can be found at <a href="https://codalab.lisn.fr">codalab.lisn.fr</a> and will soon be the main instance to use.
                     </b></p>
                     <p style='color:blue'><b>
                         To help build our community we created this