feat(nix): add rofi search shortcut

nix/nixos/home-manager/desktop/hypr/hyprland.conf

@@ -137,6 +137,7 @@ bind = $mainMod, V, togglefloating,
 bind = $mainMod, R, exec, rofi -show drun
 bind = $mainMod, C, exec, rofi -show clip
 bind = $mainMod, P, exec, rofi-rbw
+bind = $mainMod, Z, exec, rofi -dmenu -p \"Search\" | xargs -I{} xdg-open "https://www.google.com/search?q={}" && hyprctl dispatch focuswindow firefox
 bind = $mainMod SHIFT, L, exec, swaylock -f
 bind = $mainMod, U, pseudo, # dwindle
 bind = $mainMod, J, togglesplit, # dwindle