add features.applications.shellScripts option

uses a custom function from my helper flake to convert a basic attrset of strings into a format `home.file` will accept

modules/hosts/takamaki/takamaki.nix

@@ -3,6 +3,7 @@
     pkgs = inputs.nixpkgs.legacyPackages.x86_64-linux;
     modules = with self.homeModules; [
       takamaki
+      inputs.stylix.homeModules.stylix
     ];
     extraSpecialArgs = { inherit inputs; };
   };
@@ -41,17 +42,22 @@
           vscode.enable = true;
         };
 
-        extraPackages = with pkgs; [
-          (writeShellScriptBin "switch-os" ''
+        shellScripts = {
+          switch-os = ''
             sudo efibootmgr --bootnext 0000
             sudo reboot
-          '')
-          (writeShellScriptBin "universal-reboot" ''
+          '';
+
+          universal-reboot = ''
             sudo reboot
-          '')
-          (writeShellScriptBin "universal-shutdown" ''
+          '';
+
+          universal-shutdown = ''
             sudo systemctl poweroff
-          '')
+          '';
+        };
+
+        extraPackages = with pkgs; [
           (writeShellScriptBin "increase-brightness" ''
             LOOP_COUNTER=0
             DEVICE=$1