remove sitemap from allowlist

Author: Sgtpluck

_config.yml

@@ -2,6 +2,7 @@
 title: Login.gov
 description: Welcome to the Login.gov developer documentation!
 github_repo_url: https://github.com/18F/identity-dev-docs # enables "edit this page" button
+url: https://developers.login.gov
 
 # temporary_alert: "The Login.gov sandbox (<b>not production</b>) will be unavailable from <b>5-6p ET on Tuesday, January 31st, 2023</b> for maintenance."
 temporary_alert: false
@@ -12,7 +13,6 @@ plugins:
 
 whitelist:
   - jekyll-redirect-from
-  - jekyll-sitemap
 
 copy_to_destination:
   - node_modules/@18f/identity-design-system/dist/assets