Revamp contest settings into tabs

app/policies/contest_policy.rb

@@ -27,6 +27,26 @@ class ContestPolicy < ApplicationPolicy
     record.user.id == user.id || user.admin?
   end
 
+  def settings_general_edit?
+    edit?
+  end
+
+  def settings_general_update?
+    edit?
+  end
+
+  def settings_offline_edit?
+    edit?
+  end
+
+  def settings_offline_update?
+    edit?
+  end
+
+  def settings_categories_edit?
+    edit?
+  end
+
   def finalize_import?
     record.user.id == user.id || user.admin?
   end