feat(alacritty): install and enable in gui bundle

modules/home-manager/features/alacritty.nix

@@ -0,0 +1,27 @@
+{
+  # keep-sorted start
+  lib,
+  pkgs,
+  # keep-sorted end
+  ...
+}:
+{
+  programs.alacritty = {
+    enable = true;
+    settings = {
+      font = {
+        normal = {
+          family = "JetBrainsMono Nerd Font";
+          style = "Regular";
+        };
+        size = 13;
+      };
+      window.startup_mode = "Maximized";
+      terminal.shell = {
+        program = "${lib.getExe pkgs.zellij}";
+        args = [ "-l=welcome" ];
+      };
+    };
+    theme = "catppuccin_mocha";
+  };
+}