Change all Package Registry related links

In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32761,
all Package Registry related docs were brought under the same roof.

This changes the links in the app itself.

app/helpers/projects_helper.rb

@@ -562,7 +562,7 @@ module ProjectsHelper
       allowedVisibilityOptions: project_allowed_visibility_levels(project),
       visibilityHelpPath: help_page_path('public_access/public_access'),
       registryAvailable: Gitlab.config.registry.enabled,
-      registryHelpPath: help_page_path('user/project/container_registry'),
+      registryHelpPath: help_page_path('user/packages/container_registry/index'),
       lfsAvailable: Gitlab.config.lfs.enabled,
       lfsHelpPath: help_page_path('workflow/lfs/manage_large_binaries_with_git_lfs'),
       pagesAvailable: Gitlab.config.pages.enabled,

app/views/projects/registry/repositories/index.html.haml

@@ -2,7 +2,7 @@
   .row.registry-placeholder.prepend-bottom-10
     .col-12
       #js-vue-registry-images{ data: { endpoint: project_container_registry_index_path(@project, format: :json),
-        "help_page_path" => help_page_path('user/project/container_registry'),
+        "help_page_path" => help_page_path('user/packages/container_registry/index'),
         "no_containers_image" => image_path('illustrations/docker-empty-state.svg'),
         "containers_error_image" => image_path('illustrations/docker-error-state.svg'),
         "repository_url" => escape_once(@project.container_registry_url),

ee/app/helpers/ee/projects_helper.rb

@@ -79,7 +79,7 @@ module EE
     def project_permissions_panel_data(project)
       super.merge(
         packagesAvailable: ::Gitlab.config.packages.enabled && project.feature_available?(:packages),
-        packagesHelpPath: help_page_path('user/project/packages/maven_repository')
+        packagesHelpPath: help_page_path('user/packages/maven_repository/index')
       )
     end
 

ee/app/views/shared/packages/_no_packages.html.haml

@@ -2,6 +2,6 @@
 .text-content
   %h4.text-center= _('There are no packages yet')
   %p
-    - no_packages_url = help_page_path('administration/packages.html')
+    - no_packages_url = help_page_path('administration/packages/index')
     - no_packages_link_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe % { url: no_packages_url }
     = _('Learn how to %{no_packages_link_start}publish and share your packages%{no_packages_link_end} with GitLab.').html_safe % { no_packages_link_start: no_packages_link_start, no_packages_link_end: '</a>'.html_safe }