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-prism.js

@@ -0,0 +1,19 @@
+import { runHighlighterWithAstro } from "@astrojs/prism/dist/highlighter";
+import { highlightCodeBlocks } from "./highlight.js";
+const rehypePrism = (excludeLangs) => {
+  return async (tree) => {
+    await highlightCodeBlocks(
+      tree,
+      (code, language) => {
+        let { html, classLanguage } = runHighlighterWithAstro(language, code);
+        return Promise.resolve(
+          `<pre class="${classLanguage}" data-language="${language}"><code is:raw class="${classLanguage}">${html}</code></pre>`
+        );
+      },
+      excludeLangs
+    );
+  };
+};
+export {
+  rehypePrism
+};