adding desktop config

modules/home-manager/terminals/alacritty.nix

@@ -0,0 +1,11 @@
+{ ... }:
+
+{
+  programs.alacritty = {
+    enable = true;
+    settings = {
+      font.size = 11;
+      window.opacity = 0.95;
+    };
+  };
+}