Add sdg manager section to admin

Allow a user to become an sdg manager

spec/system/moderation_spec.rb

@@ -43,6 +43,21 @@ describe "Moderation" do
     expect(page).to have_content "You do not have permission to access this page"
   end
 
+  scenario "Access as SDG manager is not authorized", :js do
+    create(:sdg_manager, user: user)
+
+    login_as(user)
+    visit root_path
+
+    expect(page).not_to have_link("Moderation")
+
+    visit moderation_root_path
+
+    expect(page).not_to have_current_path(moderation_root_path)
+    expect(page).to have_current_path(root_path)
+    expect(page).to have_content "You do not have permission to access this page"
+  end
+
   scenario "Access as poll officer is not authorized" do
     create(:poll_officer, user: user)