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/prismjs/components/prism-cilkc.js

@@ -0,0 +1,8 @@
+Prism.languages.cilkc = Prism.languages.insertBefore('c', 'function', {
+	'parallel-keyword': {
+		pattern: /\bcilk_(?:for|reducer|s(?:cope|pawn|ync))\b/,
+		alias: 'keyword'
+	}
+});
+
+Prism.languages['cilk-c'] = Prism.languages['cilkc'];