change some niri config, add setup script for nobara on PC

modules/hosts/takamaki/takamaki.nix

@@ -67,15 +67,11 @@
               theme = "comfy";
             };
           };
-          thunderbird = {
-            enable = true;
-          };
+          thunderbird.enable = true;
         };
 
         extraPackages = with pkgs; [
           nix-init
-          github-desktop
-          signal-desktop
         ];
 
         shellScripts = let