Fix broken link

Author: eread

doc/settings/index.md

@@ -13,7 +13,6 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 - [Environment variables](environment-variables.md)
 - [Gitaly Cluster](praefect.md)
 - [`gitlab.yml`](gitlab.yml.md)
-- [Grafana](grafana.md)
 - [LDAP](https://docs.gitlab.com/ee/administration/auth/ldap/index.html)
 - [Logs](logs.md)
 - [Mattermost](https://docs.gitlab.com/ee/integration/mattermost/)