DOCSP-33324 Fix Legacy Shell 404 (#4777)

Author: ianf-mongodb

snooty.toml

@@ -156,7 +156,6 @@ toc_landing_pages = [
    "/reference/method/js-role-management",
    "/reference/method/js-sharding",
    "/reference/method/js-user-management",
-   "/reference/mongo",
    "/reference/mongodb-wire-protocol/",
    "/reference/operator/aggregation-pipeline",
    "/reference/operator/aggregation",