Add redirect for unused get started page

doc/intro/index.md

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-stage: Create
-group: Source Code
-info: "To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments"
-comments: false
+redirect_to: '../topics/use_gitlab.md'
+remove_date: '2021-12-08'
 ---
 
-# Get started with GitLab **(FREE)**
+This document was moved to [another location](../topics/use_gitlab.md).
 
-## Organize
-
-Create projects and groups.
-
-- [Create a new project](../user/project/working_with_projects.md#create-a-project)
-- [Create a new group](../user/group/index.md#create-a-group)
-
-## Prioritize
-
-Create issues, labels, milestones, cast your vote, and review issues.
-
-- [Create an issue](../user/project/issues/managing_issues.md#create-a-new-issue)
-- [Assign labels to issues](../user/project/labels.md)
-- [Use milestones as an overview of your project's tracker](../user/project/milestones/index.md)
-- [Use voting to express your like/dislike to issues and merge requests](../user/award_emojis.md)
-
-## Collaborate
-
-Create merge requests and review code.
-
-- [Fork a project and contribute to it](../user/project/repository/forking_workflow.md)
-- [Create a new merge request](../user/project/merge_requests/creating_merge_requests.md)
-- [Automatically close issues from merge requests](../user/project/issues/managing_issues.md#closing-issues-automatically)
-- [Automatically merge when pipeline succeeds](../user/project/merge_requests/merge_when_pipeline_succeeds.md)
-- [Revert any commit](../user/project/merge_requests/revert_changes.md)
-- [Cherry-pick any commit](../user/project/merge_requests/cherry_pick_changes.md)
-
-## Test and Deploy
-
-Use the built-in continuous integration in GitLab.
-
-- [Get started with GitLab CI/CD](../ci/quick_start/index.md)
-
-## Install and Update
-
-Install and update your GitLab installation.
-
-- [Install GitLab](https://about.gitlab.com/install/)
-- [Update GitLab](https://about.gitlab.com/update/)
-- [Explore Omnibus GitLab configuration options](https://docs.gitlab.com/omnibus/settings/configuration.html)
+<!-- This redirect file can be deleted after <2021-12-08>. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/redirects.html -->