Added nix files. revorked queue append, added library migration.

src/config/default_keymap.toml

@@ -63,6 +63,16 @@ command = "QueueAddNext"
 key_sequence = "shift-a"
 command = "QueueAddLast"
 
+[[keymaps]]
+key_sequence = "alt-k"
+command = "MoveQueueUp"
+context = "queue"
+
+[[keymaps]]
+key_sequence = "alt-j"
+command = "MoveQueueDown"
+context = "queue"
+
 [[keymaps]]
 key_sequence = "shift-c"
 command = "OpenConnectedDevices"