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-gfm-task-list-item/lib/index.d.ts

@@ -0,0 +1,23 @@
+/**
+ * Create an extension for `mdast-util-from-markdown` to enable GFM task
+ * list items in markdown.
+ *
+ * @returns {FromMarkdownExtension}
+ *   Extension for `mdast-util-from-markdown` to enable GFM task list items.
+ */
+export function gfmTaskListItemFromMarkdown(): FromMarkdownExtension
+/**
+ * Create an extension for `mdast-util-to-markdown` to enable GFM task list
+ * items in markdown.
+ *
+ * @returns {ToMarkdownExtension}
+ *   Extension for `mdast-util-to-markdown` to enable GFM task list items.
+ */
+export function gfmTaskListItemToMarkdown(): ToMarkdownExtension
+export type ListItem = import('mdast').ListItem
+export type Paragraph = import('mdast').Paragraph
+export type CompileContext = import('mdast-util-from-markdown').CompileContext
+export type FromMarkdownExtension = import('mdast-util-from-markdown').Extension
+export type FromMarkdownHandle = import('mdast-util-from-markdown').Handle
+export type ToMarkdownExtension = import('mdast-util-to-markdown').Options
+export type ToMarkdownHandle = import('mdast-util-to-markdown').Handle