Move system hooks page into admin docs

This old page should be in the admin docs, along
with file hooks and similar, as it relates to self-managed
administration

doc/administration/file_hooks.md

@@ -15,12 +15,12 @@ without modifying the GitLab source code.
 A file hook runs on each event. You can filter events or projects
 in a file hook's code, and create many file hooks as you need. Each file hook is
 triggered by GitLab asynchronously in case of an event. For a list of events
-see the [system hooks](../system_hooks/system_hooks.md) documentation.
+see the [system hooks](system_hooks.md) documentation.
 
 NOTE:
 File hooks must be configured on the file system of the GitLab server. Only GitLab
 server administrators can complete these tasks. Explore
-[system hooks](../system_hooks/system_hooks.md) or [webhooks](../user/project/integrations/webhooks.md)
+[system hooks](system_hooks.md) or [webhooks](../user/project/integrations/webhooks.md)
 as an option if you do not have file system access.
 
 Instead of writing and supporting your own file hook, you can also make changes
@@ -52,7 +52,7 @@ Follow the steps below to set up a custom hook:
    language type. For example, if the script is in Ruby the shebang will
    probably be `#!/usr/bin/env ruby`.
 1. The data to the file hook is provided as JSON on STDIN. It is exactly the
-   same as for [system hooks](../system_hooks/system_hooks.md).
+   same as for [system hooks](system_hooks.md).
 
 That's it! Assuming the file hook code is properly implemented, the hook fires
 as appropriate. The file hooks file list is updated for each event, there is no

doc/administration/index.md

@@ -40,7 +40,7 @@ Learn how to install, configure, update, and maintain your GitLab instance.
 ### Configuring GitLab
 
 - [Adjust your instance's time zone](timezone.md): Customize the default time zone of GitLab.
-- [System hooks](../system_hooks/system_hooks.md): Notifications when users, projects and keys are changed.
+- [System hooks](system_hooks.md): Notifications when users, projects and keys are changed.
 - [Security](../security/index.md): Learn what you can do to further secure your GitLab instance.
 - [Usage statistics, version check, and Service Ping](../user/admin_area/settings/usage_statistics.md): Enable or disable information about your instance to be sent to GitLab, Inc.
 - [Global user settings](user_settings.md): Configure instance-wide user permissions.

doc/api/system_hooks.md

@@ -13,7 +13,7 @@ You can configure the URL endpoint of the system hooks from the GitLab user inte
 1. On the top bar, select **Menu > Admin**.
 1. Select **System Hooks** (`/admin/hooks`).
 
-Read more about [system hooks](../system_hooks/system_hooks.md).
+Read more about [system hooks](../administration/system_hooks.md).
 
 ## List system hooks
 

doc/user/admin_area/index.md

@@ -27,7 +27,7 @@ The Admin Area is made up of the following sections:
 | **{overview}** [Overview](#overview-section)   | View your GitLab [Dashboard](#admin-area-dashboard), and administer [projects](#administering-projects), [users](#administering-users), [groups](#administering-groups), [topics](#administering-topics), [jobs](#administering-jobs), [runners](#administering-runners), and [Gitaly servers](#administering-gitaly-servers). |
 | **{monitor}** Monitoring                       | View GitLab [system information](#system-information), and information on [background jobs](#background-jobs), [logs](#logs), [health checks](monitoring/health_check.md), [requests profiles](#requests-profiles), and [audit events](#audit-events). |
 | **{messages}** Messages                        | Send and manage [broadcast messages](broadcast_messages.md) for your users. |
-| **{hook}** System Hooks                        | Configure [system hooks](../../system_hooks/system_hooks.md) for many events. |
+| **{hook}** System Hooks                        | Configure [system hooks](../../administration/system_hooks.md) for many events. |
 | **{applications}** Applications                | Create system [OAuth applications](../../integration/oauth_provider.md) for integrations with other services. |
 | **{slight-frown}** Abuse Reports               | Manage [abuse reports](review_abuse_reports.md) submitted by your users. |
 | **{license}** License                          | Add, display, and remove [licenses](license.md). |