niri: add waybar

niri/.config/niri/config.kdl

@@ -1,6 +1,8 @@
 // This config is in the KDL format: https://kdl.dev
 // https://niri-wm.github.io/niri/Configuration:-Introduction
 
+spawn-at-startup "waybar"
+
 input {
     keyboard {
         xkb {
@@ -121,6 +123,7 @@ binds {
     // Suggested binds for running programs: terminal, app launcher, screen locker.
     Mod+T hotkey-overlay-title="Open a Terminal: alacritty" { spawn "kitty" "--single-instance" "--instance-group" "default"; }
     Mod+D hotkey-overlay-title="Run an Application: wmenu" { spawn "wmenu-run" "-f" "HurmitNerdFont 10"; }
+    Mod+B hotkey-overlay-title="Toggle waybar" { spawn "killall" "-SIGUSR1" "waybar"; }
     Super+Alt+L hotkey-overlay-title="Lock the Screen: swaylock" { spawn "swaylock"; }
     Mod+Shift+T hotkey-overlay-title="Toggle theme" { spawn "lupan-set-theme" "toggle"; }