Change about page to be mounted in the web UI (#19345)

app/serializers/rest/extended_description_serializer.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class REST::ExtendedDescriptionSerializer < ActiveModel::Serializer
+  attributes :updated_at, :content
+
+  def updated_at
+    object.updated_at&.iso8601
+  end
+
+  def content
+    object.text
+  end
+end