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.js

@@ -0,0 +1,20 @@
+/**
+ * @import {Html} from 'mdast'
+ */
+
+html.peek = htmlPeek
+
+/**
+ * @param {Html} node
+ * @returns {string}
+ */
+export function html(node) {
+  return node.value || ''
+}
+
+/**
+ * @returns {string}
+ */
+function htmlPeek() {
+  return '<'
+}