Merge branch 'docs-gitlab-flow-remove' into 'master'

Remove unneeded University doc page

See merge request gitlab-org/gitlab!54388

doc/university/training/gitlab_flow.md

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-stage: none
-group: unassigned
-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
-type: reference
+redirect_to: '../../topics/gitlab_flow.md'
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-# What is the GitLab Flow
+This document was moved to [another location](../../topics/gitlab_flow.md).
 
-- A simplified branching strategy
-- All features and fixes first go to master
-- Allows for 'production' or 'stable' branches
-- Bug fixes/hot fix patches are cherry-picked from master
-
-## Feature branches
-
-- Create a feature/bugfix branch to do all work
-- Use merge requests to merge to master
-
-![inline](gitlab_flow/feature_branches.png)
-
-## Production branch
-
-- One, long-running production release branch
-  as opposed to individual stable branches
-- Consider creating a tag for each version that gets deployed
-
-![inline](gitlab_flow/production_branch.png)
-
-## Release branch
-
-- Useful if you release software to customers
-- When preparing a new release, create stable branch
-  from master
-- Consider creating a tag for each version
-- Cherry-pick critical bug fixes to stable branch for patch release
-- Never commit bug fixes directly to stable branch
-
-![inline](gitlab_flow/release_branches.png)
-
-## More details
-
-For more information, read through the [GitLab Flow](../../topics/gitlab_flow.md)
-documentation.
-
-<!-- ## Troubleshooting
-
-Include any troubleshooting steps that you can foresee. If you know beforehand what issues
-one might have when setting this up, or when something is changed, or on upgrading, it's
-important to describe those, too. Think of things that may go wrong and include them here.
-This is important to minimize requests for support, and to avoid doc comments with
-questions that you know someone might ask.
-
-Each scenario can be a third-level heading, e.g. `### Getting error message X`.
-If you have none to add when creating a doc, leave this section in place
-but commented out to help encourage others to add to it in the future. -->
+<!-- This redirect file can be deleted after <2021-05-16>. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->