Add sdg manager section to admin

Allow a user to become an sdg manager

app/models/user.rb

@@ -95,6 +95,7 @@ class User < ApplicationRecord
   scope :administrators, -> { joins(:administrator) }
   scope :moderators,     -> { joins(:moderator) }
   scope :organizations,  -> { joins(:organization) }
+  scope :sdg_managers,   -> { joins(:sdg_manager) }
   scope :officials,      -> { where("official_level > 0") }
   scope :male,           -> { where(gender: "male") }
   scope :female,         -> { where(gender: "female") }