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-extension-gfm-task-list-item/dev/lib/html.js

@@ -0,0 +1,29 @@
+/**
+ * @import {HtmlExtension} from 'micromark-util-types'
+ */
+
+/**
+ * Create an HTML extension for `micromark` to support GFM task list items when
+ * serializing to HTML.
+ *
+ * @returns {HtmlExtension}
+ *   Extension for `micromark` that can be passed in `htmlExtensions` to
+ *   support GFM task list items when serializing to HTML.
+ */
+export function gfmTaskListItemHtml() {
+  return {
+    enter: {
+      taskListCheck() {
+        this.tag('<input type="checkbox" disabled="" ')
+      }
+    },
+    exit: {
+      taskListCheck() {
+        this.tag('/>')
+      },
+      taskListCheckValueChecked() {
+        this.tag('checked="" ')
+      }
+    }
+  }
+}