Partial revert a703b5cb7

app/presenters/instance_presenter.rb

@@ -2,6 +2,7 @@
 
 class InstancePresenter
   delegate(
+    :site_contact_email,
     :site_title,
     :site_short_description,
     :site_description,
@@ -16,4 +17,8 @@ class InstancePresenter
     GabSocial::Version.source_url
   end
 
+  def thumbnail
+    @thumbnail ||= Rails.cache.fetch('site_uploads/thumbnail') { SiteUpload.find_by(var: 'thumbnail') }
+  end
+
 end