Remove old link

doc/user/project/pages/custom_domains_ssl_tls_certification/lets_encrypt_integration.md

@@ -8,7 +8,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 
 # GitLab Pages integration with Let's Encrypt **(FREE)**
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/28996) in GitLab 12.1. For versions earlier than GitLab 12.1, see the [manual Let's Encrypt instructions](../lets_encrypt_for_gitlab_pages.md).
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/28996) in GitLab 12.1.
 
 The GitLab Pages integration with Let's Encrypt (LE) allows you
 to use LE certificates for your Pages website with custom domains