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/@astrojs/markdown-remark/dist/rehype-images.d.ts

@@ -0,0 +1,3 @@
+import type { Root } from 'hast';
+import type { VFile } from 'vfile';
+export declare function rehypeImages(): (tree: Root, file: VFile) => void;