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/property-information/lib/xmlns.js

@@ -0,0 +1,9 @@
+import {create} from './util/create.js'
+import {caseInsensitiveTransform} from './util/case-insensitive-transform.js'
+
+export const xmlns = create({
+  attributes: {xmlnsxlink: 'xmlns:xlink'},
+  properties: {xmlnsXLink: null, xmlns: null},
+  space: 'xmlns',
+  transform: caseInsensitiveTransform
+})