chore: update Tailwind CSS from 3.4.15, to 4.1.11

- Changed the PostCSS configuration to use '@tailwindcss/postcss' instead of 'tailwindcss'.
- Deleted the Tailwind configuration file as it is no longer needed.

app/components/SimilarArtists.tsx

@@ -68,7 +68,7 @@ export function SimilarArtists({ artistName }: SimilarArtistsProps) {
             <Link
               key={artist.name}
               href={`/artist/${encodeURIComponent(artist.name)}`}
-              className="flex-shrink-0"
+              className="shrink-0"
             >
               <div className="w-32 space-y-2 group cursor-pointer">
                 <div className="relative w-32 h-32 bg-muted rounded-full overflow-hidden">