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/mdn-data/api/index.js

@@ -0,0 +1,3 @@
+module.exports = {
+  inheritance: require('./inheritance'),
+}