add banner

Author: mongoKart

snooty.toml

@@ -5,6 +5,7 @@ intersphinx = [
     "https://www.mongodb.com/docs/drivers/objects.inv",
     "https://www.mongodb.com/docs/atlas/objects.inv",
 ]
+eol = true
 
 toc_landing_pages = [
     "/get-started",
@@ -32,3 +33,11 @@ stable-api = "Stable API"
 vector-search = "Atlas Vector Search"
 language = "JavaScript"
 environment = "Node.js"
+docs-url = "http://mongodb.com/docs/drivers/node/current"
+
+[[banners]]
+targets = ["*"]
+variant = "info"
+value = """\
+    This version of the documentation is archived and no longer supported. View the `current documentation <{+docs-url+}>`__ to learn how to `upgrade your version of the {+driver-short+} <{+docs-url+}/upgrade/>`__.\
+    """