(DOCSP-30851) Adds banner to sunset v1.24 MCLI docs (#859)

Author: sarahsimpers

snooty.toml

@@ -1,5 +1,6 @@
 name = "mongocli"
 title = "MongoDB Command Line Interface"
+eol = true
 
 intersphinx = [ "https://www.mongodb.com/docs/ops-manager/current/objects.inv",            
                 "https://www.mongodb.com/docs/manual/objects.inv",
@@ -250,4 +251,11 @@ value = """\
     `Migrate to the Atlas CLI <https://www.mongodb.com/docs/atlas/cli/stable/migrate-to-atlas-cli/>`__ \
     to enjoy the same capabilities and the latest features. You can use \
     ``mongocli atlas`` commands until April 30, 2023.\
+    """
+
+[[banners]]
+targets = ["*"]
+variant = "info"
+value = """\
+    This version of the documentation is archived and no longer supported. View the `current documentation <https://www.mongodb.com/docs/mongocli/stable/>`__ to learn how to `upgrade your version of MongoCLI <https://www.mongodb.com/docs/mongocli/stable/install/#update-the-mongodb-cli>`__.\
     """