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/Declaration.js

@@ -0,0 +1,14 @@
+import { property } from 'css-tree';
+
+export default function cleanDeclartion(node, item, list) {
+    if (node.value.children && node.value.children.isEmpty) {
+        list.remove(item);
+        return;
+    }
+
+    if (property(node.property).custom) {
+        if (/\S/.test(node.value.value)) {
+            node.value.value = node.value.value.trim();
+        }
+    }
+};