documentation and env changes

config/services.yaml

@@ -22,12 +22,13 @@ services:
 
     App\Service\SpotifyClient:
         arguments:
-            $clientId: '%env(SPOTIFY_CLIENT_ID)%'
-            $clientSecret: '%env(SPOTIFY_CLIENT_SECRET)%'
+            $clientId: '%env(default::SPOTIFY_CLIENT_ID)%'
+            $clientSecret: '%env(default::SPOTIFY_CLIENT_SECRET)%'
 
-    App\Service\ImageStorage:
+    App\Service\UploadStorage:
         arguments:
-            $projectDir: '%kernel.project_dir%'
+            $storageRoot: '%kernel.project_dir%/public/uploads'
+            $publicPrefix: '/uploads'
 
     App\Controller\AlbumController:
         arguments: