improve keybindings, update flake inputs, fix bluetooth and battery detection

global-default.nix

@@ -65,6 +65,11 @@
     '';
   };
 
+  hardware.bluetooth = {
+    enable = true;
+    powerOnBoot = false;
+  };
+
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave