fix: Fix product page syntax errors

1. Remove duplicate/broken code in product tables section
2. Fix PostCSS config for Tailwind 4
3. Add @tailwindcss/postcss dependency
4. Remove --production flag from Dockerfile (sharp required)

All fixes enable successful Docker build with favicon working.

node_modules/property-information/lib/normalize.js

@@ -0,0 +1,12 @@
+/**
+ * Get the cleaned case insensitive form of an attribute or property.
+ *
+ * @param {string} value
+ *   An attribute-like or property-like name.
+ * @returns {string}
+ *   Value that can be used to look up the properly cased property on a
+ *   `Schema`.
+ */
+export function normalize(value) {
+  return value.toLowerCase()
+}