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/css-tree/lib/syntax/pseudo/lang.js

@@ -0,0 +1,33 @@
+import { Comma, String as StringToken, Ident, RightParenthesis } from '../../tokenizer/index.js';
+
+export function parseLanguageRangeList() {
+    const children = this.createList();
+
+    this.skipSC();
+
+    loop: while (!this.eof) {
+        switch (this.tokenType) {
+            case Ident:
+                children.push(this.Identifier());
+                break;
+
+            case StringToken:
+                children.push(this.String());
+                break;
+
+            case Comma:
+                children.push(this.Operator());
+                break;
+
+            case RightParenthesis:
+                break loop;
+
+            default:
+                this.error('Identifier, string or comma is expected');
+        }
+
+        this.skipSC();
+    }
+
+    return children;
+}