fix: Web API endpoints suddenly not available

[ReubenFrankel]

Spotify has removed support for some Web API endpoints without warning, namely:

• Audio Features
• Algorithmic and Spotify-owned editorial playlists

https://developer.spotify.com/blog/2024-11-27-changes-to-the-web-api
https://community.spotify.com/t5/Spotify-for-Developers/Changes-to-Web-API/td-p/6540414

[ReubenFrankel]

It's possible to obtain an access token from https://open.spotify.com/get_access_token. This permits access to at least the playlist-backed streams; not tested audio features.

curl -H 'Authorization: Bearer <access token>' https://api.spotify.com/v1/playlists/37i9dQZEVXbLiRSasKsNU9