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/trim-lines/index.d.ts

@@ -0,0 +1,10 @@
+/**
+ * Remove initial and final spaces and tabs at the line breaks in `value`.
+ * Does not trim initial and final spaces and tabs of the value itself.
+ *
+ * @param {string} value
+ *   Value to trim.
+ * @returns {string}
+ *   Trimmed value.
+ */
+export function trimLines(value: string): string