(DOCSP-20978) Atlas CLI prep- Adds banner to all mongocli atlas pages to warn of deprecation (#681)

* (DOCSP-20978) Adds banner to all mongocli atlas pages to warn of deprecation

* Changes target to wildcard and adds links to value

* Removes one * and reformats value

* Adds changes from copy reviewers

* Includes change from tech review

* Changes link, removes word support

* Removes changes to vs code file

Author: sarahsimpers

snooty.toml

@@ -240,3 +240,14 @@ tls = ":abbr:`TLS (Transport Layer Security)`"
 url = ":abbr:`URL (Uniform Resource Locator)`"
 utc = ":abbr:`UTC (Coordinated Universal Time)`"
 vpc = ":abbr:`VPC (Virtual Private Cloud)`"
+
+[[banners]]
+targets = ["command/mongocli-atlas*.txt"]
+variant = "warning"
+value = """\
+    ``mongocli atlas`` commands are now deprecated because there's a new, \
+    dedicated CLI available for Atlas users. \
+    `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.\
+    """