docs: improved commerce modules [4/n] (#9517)

Improve pricing, product, and promotion modules docs

[4/n]

www/apps/resources/next.config.mjs

@@ -74,6 +74,21 @@ const nextConfig = {
         destination: "/commerce-modules/inventory/links-to-other-modules",
         permanent: true,
       },
+      {
+        source: "/commerce-modules/pricing/relations-to-other-modules",
+        destination: "/commerce-modules/pricing/links-to-other-modules",
+        permanent: true,
+      },
+      {
+        source: "/commerce-modules/product/relations-to-other-modules",
+        destination: "/commerce-modules/product/links-to-other-modules",
+        permanent: true,
+      },
+      {
+        source: "/commerce-modules/promotion/relations-to-other-modules",
+        destination: "/commerce-modules/promotion/links-to-other-modules",
+        permanent: true,
+      },
     ]
   },
   // Redirects shouldn't be necessary anymore since we have remark / rehype