Add quick link to GitLab.com settings

doc/README.md

@@ -38,6 +38,7 @@ Have a look at some of our most popular documentation resources:
 | [GitLab CI/CD examples](ci/examples/README.md)                  | Get up to speed quickly with common CI/CD scenarios.             |
 | [GitLab Container Registry](user/project/container_registry.md) | Host containers within GitLab.                                   |
 | [GitLab Pages](user/project/pages/index.md)                     | Host static websites for your projects with GitLab.              |
+| [GitLab.com settings](user/gitlab_com/index.md)                 | Settings for [GitLab.com](#gitlabcom).                           |
 | [Kubernetes integration](user/project/clusters/index.md)        | Use GitLab with Kubernetes.                                      |
 | [SSH authentication](ssh/README.md)                             | Secure your network communications.                              |
 | [Using Docker images](ci/docker/using_docker_images.md)         | Build and test your applications with Docker.                    |