Adjust url to song creation tutorial

_data/songs.json

@@ -9,6 +9,6 @@
 	"title": "Create",
 	"icon": "file-text-o",
 	"description": "Your favourite song isn't available? Just try to make your own songs for Vocaluxe.",
-	"url_text": "Tutorial",
-	"url": ""
+	"url_text": "Tutorial overview",
+	"url": "https://www.open-music-games.org/play-and-create/song-editors#video-tutorials"
 }]