Refresh README TODOs and product card styling

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/features/register/ProductCard.module.css

@@ -5,7 +5,7 @@
   padding: 1rem;
   border: none;
   border-radius: 4px;
-  background: rgb(35, 15, 41);
+  background: rgb(88, 59, 99);
   transition:
     background-color 0.1s ease-out,
     border 0.1s ease-out;