refactor: added flake parts

modules/hosts/home/leyla/impermanence.nix

@@ -0,0 +1,21 @@
+{...}: {
+  flake.homeModules.leylaImpermanence = {
+    lib,
+    config,
+    ...
+  }: {
+    config = lib.mkIf (config.impermanence.enable) {
+      home.persistence."${config.impermanence.persistencePath}" = {
+        directories = [
+          "desktop"
+          "downloads"
+          "documents"
+        ];
+        files = [
+          ".bash_history" # keep shell history around
+          "${config.xdg.dataHome}/recently-used.xbel" # gnome recently viewed files
+        ];
+      };
+    };
+  };
+}