Fro some reason the https://moodle.academy/ can't be used in the Moodle mobile app and I can't see a standalone branded app for it either. Apart from simply wanting to use the app for this moodle instance I think the academy should be the showcase example of the best Moodle can offer and there are very few public real Moodle sites you can experience moodle in with proper courses, eg moodle.org isn't 'real' in the sense of doing courses and getting completions and certificates etc.