refactor: organize pages into folders

README.md

@@ -72,8 +72,8 @@ src/
   adminRouteTree.tsx       # admin routes
   components/              # reusable public components
   layouts/                 # public/admin layout shells
-  pages/                   # public pages
-  pages/admin/             # admin pages
+  pages/                   # public pages; one folder per page, e.g. Home/index.tsx
+  pages/admin/             # admin pages; one folder per page, e.g. Resources/index.tsx
   utils/                   # formatting/display helpers
 ```