What we’re trying to achieve:
We’d like to keep the custom code we use in the Hosted Pages in our version control system, and push changes to Auth0 automatically (without any manual steps).
Auth0 provides API endpoints to create and update Rules, but as far as I can see there is nothing similar for Hosted Pages.
You might be able to use the GitHub Deployments extension. I’m using that for rules, hosted pages, and database connections, while also writing API scripts for the rest of the configuration. See https://manage.auth0.com/#/extensions