[Megabranch] Add new top-level docset, "Migrations" (#35085)

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>
Co-authored-by: Sarah Schneider <sarahs@github.com>
Co-authored-by: Vanessa <vgrl@github.com>

Author: 4 people

assets/images/help/github-enterprise-importer/attribution-invitations-tab.png

@@ -763,7 +763,7 @@ All Storage tests passed
 
 `ghe-migrator` is a hi-fidelity tool to help you migrate from one GitHub instance to another. You can consolidate your instances or move your organization, users, teams, and repositories from GitHub.com to {% data variables.product.prodname_enterprise %}.
 
-For more information, please see our guides on [migrating data to and from your enterprise](/admin/user-management/migrating-data-to-and-from-your-enterprise).
+For more information, please see our guides on [migrating data to and from your enterprise](/migrations/using-ghe-migrator).
 
 ### git-import-detect
 
@@ -774,28 +774,28 @@ git-import-detect
 
 ### git-import-hg-raw
 
-This utility imports a Mercurial repository to this Git repository. For more information, see "[AUTOTITLE](/admin/user-management/migrating-data-to-and-from-your-enterprise/importing-data-from-third-party-version-control-systems)."
+This utility imports a Mercurial repository to this Git repository. For more information, see "[AUTOTITLE](/migrations/importing-source-code/using-the-command-line-to-import-source-code/importing-from-other-version-control-systems-with-the-administrative-shell)."
 ```shell
 git-import-hg-raw
 ```
 
 ### git-import-svn-raw
 
-This utility imports Subversion history and file data into a Git branch. This is a straight copy of the tree, ignoring any trunk or branch distinction. For more information, see "[AUTOTITLE](/admin/user-management/migrating-data-to-and-from-your-enterprise/importing-data-from-third-party-version-control-systems)."
+This utility imports Subversion history and file data into a Git branch. This is a straight copy of the tree, ignoring any trunk or branch distinction. For more information, see "[AUTOTITLE](/migrations/importing-source-code/using-the-command-line-to-import-source-code/importing-from-other-version-control-systems-with-the-administrative-shell)."
 ```shell
 git-import-svn-raw
 ```
 
 ### git-import-tfs-raw
 
-This utility imports from Team Foundation Version Control (TFVC). For more information, see "[AUTOTITLE](/admin/user-management/migrating-data-to-and-from-your-enterprise/importing-data-from-third-party-version-control-systems)."
+This utility imports from Team Foundation Version Control (TFVC). For more information, see "[AUTOTITLE](/migrations/importing-source-code/using-the-command-line-to-import-source-code/importing-from-other-version-control-systems-with-the-administrative-shell))."
 ```shell
 git-import-tfs-raw
 ```
 
 ### git-import-rewrite
 
-This utility rewrites the imported repository. This gives you a chance to rename authors and, for Subversion and TFVC, produces Git branches based on folders. For more information, see "[AUTOTITLE](/admin/user-management/migrating-data-to-and-from-your-enterprise/importing-data-from-third-party-version-control-systems)."
+This utility rewrites the imported repository. This gives you a chance to rename authors and, for Subversion and TFVC, produces Git branches based on folders. For more information, see "[AUTOTITLE](/migrations/importing-source-code/using-the-command-line-to-import-source-code/importing-from-other-version-control-systems-with-the-administrative-shell)."
 ```shell
 git-import-rewrite
 ```

assets/images/help/github-enterprise-importer/mannequin-example.png

@@ -104,7 +104,6 @@ includeGuides:
   - /admin/policies/enforcing-policies-for-your-enterprise/enforcing-team-policies-in-your-enterprise
   - /admin/policies/enforcing-policies-for-your-enterprise/restricting-email-notifications-for-your-enterprise
   - /admin/policies/managing-pre-receive-hooks-on-the-github-enterprise-server-appliance
-  - /admin/user-management/about-migrations
   - /admin/user-management/adding-people-to-teams
   - /admin/user-management/auditing-ssh-keys
   - /admin/user-management/auditing-users-across-your-enterprise
@@ -113,9 +112,6 @@ includeGuides:
   - /admin/user-management/continuous-integration-using-jenkins
   - /admin/user-management/creating-teams
   - /admin/user-management/disabling-git-ssh-access-on-your-enterprise
-  - /admin/user-management/exporting-migration-data-from-githubcom
-  - /admin/user-management/exporting-migration-data-from-your-enterprise
-  - /admin/user-management/importing-data-from-third-party-version-control-systems
   - /admin/user-management/managing-dormant-users
   - /admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/about-the-audit-log-for-your-enterprise
   - /admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/accessing-the-audit-log-for-your-enterprise
@@ -136,10 +132,8 @@ includeGuides:
   - /admin/user-management/managing-users-in-your-enterprise/roles-in-an-enterprise
   - /admin/user-management/managing-users-in-your-enterprise/viewing-and-managing-a-users-saml-access-to-your-enterprise
   - /admin/user-management/managing-users-in-your-enterprise/viewing-people-in-your-enterprise
-  - /admin/user-management/migrating-data-to-your-enterprise
   - /admin/user-management/migrating-to-internal-repositories
   - /admin/user-management/placing-a-legal-hold-on-a-user-or-organization
-  - /admin/user-management/preparing-to-migrate-data-to-your-enterprise
   - /admin/user-management/preventing-users-from-creating-organizations
   - /admin/user-management/rebuilding-contributions-data
   - /admin/user-management/removing-users-from-teams-and-organizations
@@ -152,4 +146,3 @@ includeGuides:
   - /admin/configuration/administering-your-instance-from-the-management-console/accessing-the-management-console
   - /admin/configuration/administering-your-instance-from-the-management-console/troubleshooting-access-to-the-management-console
 ---
-

assets/images/help/github-enterprise-importer/migration-log-issue.png

@@ -102,7 +102,7 @@ The `$GITHUB_VIA` variable is available in the pre-receive hook environment when
 | <pre>releases delete button</pre> | Deletion of a release | "[AUTOTITLE](/repositories/releasing-projects-on-github/managing-releases-in-a-repository#deleting-a-release)" |
 | <pre>stafftools branch restore</pre> | Restoration of a branch from the site admin dashboard | "[AUTOTITLE](/admin/configuration/configuring-your-enterprise/site-admin-dashboard#repositories)" |
 | <pre>tag create api</pre> | Creation of a tag via the API | "[AUTOTITLE](/rest/git#create-a-tag-object)" in the REST API documentation |
-| <pre>slumlord (#SHA)</pre> | Commit via Subversion | "[AUTOTITLE](/get-started/importing-your-projects-to-github/working-with-subversion-on-github/support-for-subversion-clients#making-commits-to-subversion)" |
+| <pre>slumlord (#SHA)</pre> | Commit via Subversion | "[AUTOTITLE](/get-started/working-with-subversion-on-github/support-for-subversion-clients#making-commits-to-subversion)" |
 | <pre>web branch create</pre> | Creation of a branch via the web interface | "[AUTOTITLE](/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-and-deleting-branches-within-your-repository#creating-a-branch)" |
 
 #### Available for pull request merges

content/admin/configuration/configuring-your-enterprise/command-line-utilities.md

@@ -18,6 +18,4 @@ children:
   - /managing-users-in-your-enterprise
   - /managing-organizations-in-your-enterprise
   - /managing-repositories-in-your-enterprise
-  - /migrating-data-to-and-from-your-enterprise
 ---
-

content/admin/guides.md

@@ -90,7 +90,7 @@ You can also install {% data variables.product.prodname_cli %} to use {% data va
 
 {% data reusables.subversion.sunset %}
 
-You can also use a [Subversion](https://subversion.apache.org/) client to access any repository on {% data variables.product.prodname_dotcom %}. Subversion offers a different feature set than Git. For more information, see "[AUTOTITLE](/get-started/importing-your-projects-to-github/working-with-subversion-on-github/what-are-the-differences-between-subversion-and-git)"
+You can also use a [Subversion](https://subversion.apache.org/) client to access any repository on {% data variables.product.prodname_dotcom %}. Subversion offers a different feature set than Git. For more information, see "[AUTOTITLE](/get-started/working-with-subversion-on-github/what-are-the-differences-between-subversion-and-git)"
 
-You can also access repositories on {% data variables.product.prodname_dotcom %} from Subversion clients. For more information, see "[AUTOTITLE](/get-started/importing-your-projects-to-github/working-with-subversion-on-github/support-for-subversion-clients)."
+You can also access repositories on {% data variables.product.prodname_dotcom %} from Subversion clients. For more information, see "[AUTOTITLE](/get-started/working-with-subversion-on-github/support-for-subversion-clients)."
 {% endif %}