Docs: move article LDAP-CE to its topic-related folder

doc/administration/auth/ldap.md

@@ -38,6 +38,9 @@ in the application settings.
 
 ## Configuration
 
+For a complete guide on configuring LDAP with GitLab Community Edition, please check
+the admin guide [How to configure LDAP with GitLab CE](how_to_configure_ldap_gitlab_ce/index.md).
+
 To enable LDAP integration you need to add your LDAP server settings in
 `/etc/gitlab/gitlab.rb` or `/home/git/gitlab/config/gitlab.yml`.
 

doc/articles/index.md

@@ -10,16 +10,6 @@ They are written by members of the GitLab Team and by
 Part of the articles listed below link to the [GitLab Blog](https://about.gitlab.com/blog/),
 where they were originally published.
 
-## Authentication
-
-Explore GitLab's supported [authentications methods](../topics/authentication/index.md):
-
-| Article title | Category | Publishing date |
-| :------------ | :------: | --------------: |
-| **LDAP** |
-| [How to configure LDAP with GitLab CE](how_to_configure_ldap_gitlab_ce/index.md)| Admin guide | 2017-05-03 |
-| [How to configure LDAP with GitLab EE](https://docs.gitlab.com/ee/articles/how_to_configure_ldap_gitlab_ee/) | Admin guide | 2017-05-03 |
-
 ## Build, test, and deploy with GitLab CI/CD
 
 Build, test, and deploy the software you develop with [GitLab CI/CD](../ci/README.md):

doc/topics/authentication/index.md

@@ -20,7 +20,7 @@ This page gathers all the resources for the topic **Authentication** within GitL
 - [LDAP (Enterprise Edition)](https://docs.gitlab.com/ee/administration/auth/ldap-ee.html)
 - [Enforce Two-factor Authentication (2FA)](../../security/two_factor_authentication.md#enforce-two-factor-authentication-2fa)
 - **Articles:**
-  - [How to Configure LDAP with GitLab CE](../../articles/how_to_configure_ldap_gitlab_ce/index.md)
+  - [How to Configure LDAP with GitLab CE](../../administration/auth/how_to_configure_ldap_gitlab_ce/index.md)
   - [How to Configure LDAP with GitLab EE](https://docs.gitlab.com/ee/articles/how_to_configure_ldap_gitlab_ee/)
   - [Feature Highlight: LDAP Integration](https://about.gitlab.com/2014/07/10/feature-highlight-ldap-sync/)
   - [Debugging LDAP](https://about.gitlab.com/handbook/support/workflows/ldap/debugging_ldap.html)