feat(richie user env): adding app_image_path configuration

users/richie/home/app_image_path.nix

@@ -0,0 +1,5 @@
+{
+  home.sessionPath = [
+    "/home/richie/app_images/"
+  ];
+}

users/richie/systems/rhapsody-in-green.nix

@@ -1,5 +1,6 @@
 {
   imports = [
+    ../home/app_image_path.nix
     ../home/global.nix
     ../home/gui
   ];