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/index.d.ts

@@ -0,0 +1,17 @@
+export {gfmTaskListItemHtml} from './lib/html.js'
+export {gfmTaskListItem} from './lib/syntax.js'
+
+/**
+ * Augment types.
+ */
+declare module 'micromark-util-types' {
+  /**
+   * Token types.
+   */
+  interface TokenTypeMap {
+    taskListCheck: 'taskListCheck'
+    taskListCheckMarker: 'taskListCheckMarker'
+    taskListCheckValueChecked: 'taskListCheckValueChecked'
+    taskListCheckValueUnchecked: 'taskListCheckValueUnchecked'
+  }
+}