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/micromark/lib/postprocess.js

@@ -0,0 +1,18 @@
+/**
+ * @import {Event} from 'micromark-util-types'
+ */
+
+import { subtokenize } from 'micromark-util-subtokenize';
+
+/**
+ * @param {Array<Event>} events
+ *   Events.
+ * @returns {Array<Event>}
+ *   Events.
+ */
+export function postprocess(events) {
+  while (!subtokenize(events)) {
+    // Empty
+  }
+  return events;
+}