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/parse-latin/lib/plugin/remove-empty-nodes.js

@@ -0,0 +1,23 @@
+/**
+ * @typedef {import('nlcst').Paragraph} Paragraph
+ * @typedef {import('nlcst').Root} Root
+ */
+
+import {modifyChildren} from 'unist-util-modify-children'
+
+// Remove empty children.
+export const removeEmptyNodes = modifyChildren(
+  /**
+   * @type {import('unist-util-modify-children').Modifier<Paragraph | Root>}
+   */
+
+  function (child, index, parent) {
+    if ('children' in child && child.children.length === 0) {
+      parent.children.splice(index, 1)
+
+      // Next, iterate over the node *now* at the current position (which was the
+      // next node).
+      return index
+    }
+  }
+)