On the “Obtain a Spotify Token” step of this project, you are advised to use the Implicit Grant Flow option for authorization. But to use any kind of authoriziation on Spotify you need to register your project, and you need to provide at least a Redirect URI, and there is also a field for Website. I am unsure what to put into these fields, and this is a roadblock to me continuing with the project. I have a Github pages site where I may ultimately host this project, but I am unsure what to do to continue with local development of this project.
Here is a screenshot of the form: