Add and configure flameshot for screenshots

system/nixos/home-manager/desktop.nix

@@ -1,4 +1,4 @@
-{ config, inputs, pkgs }:
+{ config, inputs, pkgs, username }:
 
 {
   imports = [
@@ -18,6 +18,20 @@
     };
   };
 
+  services.flameshot = {
+    enable = true;
+
+    settings = {
+      General = {
+        disabledTrayIcon = false;
+        saveAfterCopy = true;
+        savePath = "/home/${username}/Pictures/Screenshots";
+        showHelp = false;
+        uiColor = "#60a5fa";
+      };
+    };
+  };
+
   xdg.configFile.wallpaper = {
     source = ../../../config/wallpaper;
     recursive = true;