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/root.d.ts

@@ -0,0 +1,13 @@
+/**
+ * @param {Root} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function root(node: Root, _: Parents | undefined, state: State, info: Info): string;
+import type { Root } from 'mdast';
+import type { Parents } from 'mdast';
+import type { State } from 'mdast-util-to-markdown';
+import type { Info } from 'mdast-util-to-markdown';
+//# sourceMappingURL=root.d.ts.map