Add sdg manager section to admin

Allow a user to become an sdg manager

app/components/admin/header.rb

@@ -0,0 +1,13 @@
+module Admin::Header
+  extend ActiveSupport::Concern
+
+  def header(options: {})
+    provide(:title) do
+      title
+    end
+
+    tag.h2 options do
+      title
+    end
+  end
+end