Add server rules (#15769)

app/views/admin/rules/_rule.html.haml

@@ -0,0 +1,11 @@
+.announcements-list__item
+  = link_to edit_admin_rule_path(rule), class: 'announcements-list__item__title' do
+    = "#{rule_counter + 1}."
+    = truncate(rule.text)
+
+  .announcements-list__item__action-bar
+    .announcements-list__item__meta
+      = rule.text
+
+    %div
+      = table_link_to 'trash', t('admin.rules.delete'), admin_rule_path(rule), method: :delete, data: { confirm: t('admin.accounts.are_you_sure') } if can?(:destroy, rule)

app/views/admin/rules/edit.html.haml

@@ -0,0 +1,11 @@
+- content_for :page_title do
+  = t('admin.rules.edit')
+
+= simple_form_for @rule, url: admin_rule_path(@rule) do |f|
+  = render 'shared/error_messages', object: @rule
+
+  .fields-group
+    = f.input :text, wrapper: :with_block_label
+
+  .actions
+    = f.button :button, t('generic.save_changes'), type: :submit

app/views/admin/rules/index.html.haml

@@ -0,0 +1,24 @@
+- content_for :page_title do
+  = t('admin.rules.title')
+
+.simple_form
+  %p.hint= t('admin.rules.description')
+
+- if can? :create, :rule
+  = simple_form_for @rule, url: admin_rules_path do |f|
+    = render 'shared/error_messages', object: @rule
+
+    .fields-group
+      = f.input :text, wrapper: :with_block_label
+
+    .actions
+      = f.button :button, t('admin.rules.add_new'), type: :submit
+
+  %hr.spacer/
+
+- if @rules.empty?
+  %div.muted-hint.center-text
+    = t 'admin.rules.empty'
+- else
+  .announcements-list
+    = render partial: 'rule', collection: @rules