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/csso/lib/clean/Raw.js

@@ -0,0 +1,9 @@
+import { isNodeChildrenList } from './utils.js';
+
+export default function cleanRaw(node, item, list) {
+    // raw in stylesheet or block children
+    if (isNodeChildrenList(this.stylesheet, list) ||
+        isNodeChildrenList(this.block, list)) {
+        list.remove(item);
+    }
+};