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/astro/components/ResponsivePicture.astro

@@ -0,0 +1,12 @@
+---
+import { default as Picture, type Props as PictureProps } from './Picture.astro';
+
+type Props = PictureProps;
+
+const { class: className, ...props } = Astro.props;
+import './image.css';
+---
+
+{/* Applying class outside of the spread prevents it from applying unnecessary astro-* classes */}
+
+<Picture {...props} class={className} />