Add powermenu script and apply Tomorrow Night color theme

- Add scripts/powermenu.sh with logout, restart, sleep, shutdown options
- Create wofi/style.css with Tomorrow Night colors
- Apply Tomorrow Night theme to niri, waybar, mako, alacritty, and wofi

niri/config.kdl

@@ -3,8 +3,8 @@ layout {
 
     border {
         width 2
-        active-color "#ffb86c"
-        inactive-color "#444444"
+        active-color "#81a2be"
+        inactive-color "#373b41"
     }
 
     focus-ring {
@@ -39,6 +39,7 @@ binds {
     Print { spawn-sh "grim -g \"$(slurp)\" ~/Pictures/screenshot-$(date +%s).png"; }
 
     Mod+Shift+E { spawn "swaylock" "-f" "-c" "000000"; }
+    Mod+Shift+P { spawn "bash" "/home/alex/Documents/dotfiles/scripts/powermenu.sh"; }
     Mod+Shift+X { quit; }
 
     XF86AudioRaiseVolume allow-when-locked=true { spawn "pamixer" "-i" "5"; }