Unless I misunderstand the question, you can't do what you're asking to do. Apple doesn't allow you to bypass their store and host public apps on a website. The exception is an enterprise app, which requires an Enterprise account with both Apple and Adobe. This type of enterprise app can be distributed only within the company. If that's what you want to do, you can learn more here:
Digital Publishing Suite Help | Creating viewer apps for private distribution
Another option is to add the development app to several devices and use those for your demo.