feat: restructure and move apps into their own configs (#2)

home/programs/atuin.nix

@@ -0,0 +1,17 @@
+{
+  pkgs,
+  lib,
+  device,
+  ...
+}: {
+  programs.atuin = {
+    settings = {
+      auto_sync = true;
+      sync_frequency = "1m";
+      sync_address = "https://atuin.darksailor.dev";
+    };
+    enable = true;
+    enableFishIntegration = true;
+    enableNushellIntegration = true;
+  };
+}