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-to-hast/index.js

@@ -0,0 +1,7 @@
+// Note: types exposed from `index.d.ts`.
+export {handlers as defaultHandlers} from './lib/handlers/index.js'
+export {toHast} from './lib/index.js'
+export {
+  defaultFootnoteBackContent,
+  defaultFootnoteBackLabel
+} from './lib/footer.js'