Update UI links to mirroring pages

Now that we've moved and split these pages, update the UI links so
we get a green pipeline.

app/views/projects/mirrors/_mirror_repos.html.haml

@@ -10,7 +10,7 @@
       = expanded ? _('Collapse') : _('Expand')
     %p
       = _('Set up your project to automatically push and/or pull changes to/from another repository. Branches, tags, and commits will be synced automatically.')
-      = link_to _('How do I mirror repositories?'), help_page_path('user/project/repository/repository_mirroring'), target: '_blank', rel: 'noopener noreferrer'
+      = link_to _('How do I mirror repositories?'), help_page_path('user/project/repository/mirror/index.md'), target: '_blank', rel: 'noopener noreferrer'
 
   .settings-content
     - if mirror_settings_enabled
@@ -32,7 +32,7 @@
               = label_tag :only_protected_branches, _('Mirror only protected branches'), class: 'form-check-label'
               .form-text.text-muted
                 = _('If enabled, only protected branches will be mirrored.')
-                = link_to _('Learn more.'), help_page_path('user/project/repository/repository_mirroring', anchor: 'mirror-only-protected-branches'), target: '_blank', rel: 'noopener noreferrer'
+                = link_to _('Learn more.'), help_page_path('user/project/repository/mirror/index.md', anchor: 'mirror-only-protected-branches'), target: '_blank', rel: 'noopener noreferrer'
 
           .panel-footer
             = f.submit _('Mirror repository'), class: 'gl-button btn btn-confirm js-mirror-submit qa-mirror-repository-button', name: :update_remote_mirror

app/views/projects/mirrors/_mirror_repos_push.html.haml

@@ -12,4 +12,4 @@
     = label_tag :keep_divergent_refs, _('Keep divergent refs'), class: 'form-check-label'
     .form-text.text-muted
       - link_opening_tag = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe
-      = html_escape(_('Do not force push over diverged refs. After the mirror is created, this setting can only be modified using the API. %{mirroring_docs_link_start}Learn more about this option%{link_closing_tag} and %{mirroring_api_docs_link_start}the API.%{link_closing_tag}')) % { mirroring_docs_link_start: link_opening_tag % {url: help_page_path('user/project/repository/repository_mirroring', anchor: 'keep-divergent-refs')}, mirroring_api_docs_link_start: link_opening_tag % {url: help_page_path('api/remote_mirrors')}, link_closing_tag: '</a>'.html_safe }
+      = html_escape(_('Do not force push over diverged refs. After the mirror is created, this setting can only be modified using the API. %{mirroring_docs_link_start}Learn more about this option%{link_closing_tag} and %{mirroring_api_docs_link_start}the API.%{link_closing_tag}')) % { mirroring_docs_link_start: link_opening_tag % {url: help_page_path('user/project/repository/mirror/push.md', anchor: 'keep-divergent-refs')}, mirroring_api_docs_link_start: link_opening_tag % {url: help_page_path('api/remote_mirrors')}, link_closing_tag: '</a>'.html_safe }

ee/app/views/projects/mirrors/_mirror_repos_form.html.haml

@@ -38,7 +38,7 @@
     = f.label :mirror_overwrites_diverged_branches, _('Overwrite diverged branches'), class: 'form-check-label'
     .form-text.text-muted
       = _("If disabled, a diverged local branch will not be automatically updated with commits from its remote counterpart, to prevent local data loss. If the default branch (%{default_branch}) has diverged and cannot be updated, mirroring will fail. Other diverged branches are silently ignored.") % { default_branch: @project.default_branch }
-      = link_to _('Learn more.'), help_page_path('user/project/repository/repository_mirroring', anchor: 'overwrite-diverged-branches'), target: '_blank', rel: 'noopener noreferrer'
+      = link_to _('Learn more.'), help_page_path('user/project/repository/mirror/pull.md', anchor: 'overwrite-diverged-branches'), target: '_blank', rel: 'noopener noreferrer'
 
   - if @project.builds_enabled?
     = render 'shared/mirror_trigger_builds_setting', f: f, checked: false

ee/app/views/shared/_ci_cd_only_link.html.haml

 - return if ci_cd_only
 
-- docs_link = help_page_path('user/project/repository/repository_mirroring', anchor: 'ssh-authentication')
+- docs_link = help_page_path('user/project/repository/mirror/index.md', anchor: 'ssh-authentication')
 - link_start = "<a href='#{docs_link}' rel='noopener noreferrer' target='_blank'>".html_safe
 
 %li

ee/app/views/shared/_mirror_trigger_builds_setting.html.haml

@@ -8,4 +8,4 @@
   .form-text.text-muted
     = _('Trigger pipelines when branches or tags are updated in the upstream repository. Depending on the activity of the upstream repository, this may greatly increase the load on your CI runners. Only enable this if you know they can handle the load.')
     %strong= _('CI will run using the credentials assigned above.')
-    = link_to _('Learn more.'), help_page_path('user/project/repository/repository_mirroring', anchor: 'trigger-pipelines-for-mirror-updates'), target: '_blank', rel: 'noopener noreferrer'
+    = link_to _('Learn more.'), help_page_path('user/project/repository/mirror/pull.md', anchor: 'trigger-pipelines-for-mirror-updates'), target: '_blank', rel: 'noopener noreferrer'