Document updates to providing custom content for the Mauro Data Mapper about page #60
Description
This page https://maurodatamapper.github.io/installing/branding/branding/#edit-page-content explains how to edit some of the page content in the Mauro Data Mapper for customisation.
A new feature explained in MauroDataMapper/mdm-ui#501 allows the "About" page to now be customised. This documentation page should therefore be updated to explain how this can be achieved.