delete duplicate sections

doc/administration/index.md

@@ -43,13 +43,6 @@ Learn how to install, configure, update, and maintain your GitLab instance.
 - [Welcome message](../customization/welcome_message.md): Add a custom welcome message to the sign-in page.
 - ["New Project" page](../customization/new_project_page.md): Customize the text to be displayed on the page that opens whenever your users create a new project.
 
-#### Customizing GitLab's appearance
-
-- [Header logo](../customization/branded_page_and_email_header.md): Change the logo on all pages and email headers.
-- [Branded login page](../customization/branded_login_page.md): Customize the login page with your own logo, title, and description.
-- [Welcome message](../customization/welcome_message.md): Add a custom welcome message to the sign-in page.
-- ["New Project" page](../customization/new_project_page.md): Customize the text to be displayed on the page that opens whenever your users create a new project.
-
 ### Maintaining GitLab
 
 - [Raketasks](../raketasks/README.md): Perform various tasks for maintenance, backups, automatic webhooks setup, etc.

doc/ci/README.md

@@ -83,15 +83,6 @@ Leverage the power of Docker to run your CI pipelines.
 - [CI services (linked Docker containers)](services/README.md)
 - Article (2016-03-01): [Setting up GitLab Runner For Continuous Integration](https://about.gitlab.com/2016/03/01/gitlab-runner-with-docker/)
 
-## GitLab CI/CD for Docker
-
-Leverage the power of Docker to run your CI pipelines.
-
-- [Use Docker images with GitLab Runner](docker/using_docker_images.md)
-- [Use CI to build Docker images](docker/using_docker_build.md)
-- [CI services (linked Docker containers)](services/README.md)
-- Article (2016-03-01): [Setting up GitLab Runner For Continuous Integration](https://about.gitlab.com/2016/03/01/gitlab-runner-with-docker/)
-
 ## Review Apps
 
 - [Review Apps documentation](review_apps/index.md)