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/mdast-util-to-markdown/lib/handle/html.d.ts

@@ -0,0 +1,15 @@
+/**
+ * @param {Html} node
+ * @returns {string}
+ */
+export function html(node: Html): string;
+export namespace html {
+    export { htmlPeek as peek };
+}
+import type { Html } from 'mdast';
+/**
+ * @returns {string}
+ */
+declare function htmlPeek(): string;
+export {};
+//# sourceMappingURL=html.d.ts.map