[Podcast API] New demo.PodcastAPI.com

We've completely revamped demo.PodcastAPI.com to better showcase the search capabilities of the Podcast API.

The demo site is hosted on Cloudflare Pages.

The entire source code for this demo is available on GitHub at ListenNotes/demo.podcastapi.com. We encourage you to fork the repo, experiment with the implementation, and use it as a foundation for your own projects.

Check out the new UI below: