Refactor server hooks documentation

Also adds front matter for Gitaly group to other files.

doc/administration/geo/replication/datatypes.md

@@ -147,7 +147,7 @@ successfully, you must replicate their data using some other means.
 | [Versioned snippets](../../../user/snippets.md#versioned-snippets) | [No](https://gitlab.com/groups/gitlab-org/-/epics/2809)  | [No](https://gitlab.com/groups/gitlab-org/-/epics/2810) |                                                                                                            |
 | Project snippets                                                     | **Yes** (10.2)                                                  | **Yes** (10.2)                                                  |                                                                                                            |
 | Object pools for forked project deduplication                        | **Yes**                                                   | No                                                      |                                                                                                            |
-| [Server-side Git Hooks](../../custom_hooks.md)                       | No                                                       | No                                                      |                                                                                                            |
+| [Server-side Git hooks](../../server_hooks.md)                       | No                                                       | No                                                      |                                                                                                            |
 | [Elasticsearch integration](../../../integration/elasticsearch.md)   | [No](https://gitlab.com/gitlab-org/gitlab/-/issues/1186) | No                                                      |                                                                                                            |
 | [GitLab Pages](../../pages/index.md)                                 | [No](https://gitlab.com/groups/gitlab-org/-/epics/589)   | No                                                      |                                                                                                            |
 | [Container Registry](../../packages/container_registry.md)           | **Yes** (12.3)                                                 | No                                                      |                                                                                                            |

doc/administration/repository_storage_paths.md

+---
+stage: Create
+group: Gitaly
+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/#designated-technical-writers
+type: reference, howto
+---
+
 # Repository storage paths
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/4578) in GitLab 8.10.

doc/administration/repository_storage_types.md

+---
+stage: Create
+group: Gitaly
+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/#designated-technical-writers
+type: reference, howto
+---
+
 # Repository storage types **(CORE ONLY)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/28283) in GitLab 10.0.