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/dist/core/shiki.js

@@ -0,0 +1,16 @@
+import {
+  createShikiHighlighter
+} from "@astrojs/markdown-remark";
+const cachedHighlighters = /* @__PURE__ */ new Map();
+function getCachedHighlighter(opts) {
+  const key = JSON.stringify(opts, Object.keys(opts).sort());
+  if (cachedHighlighters.has(key)) {
+    return cachedHighlighters.get(key);
+  }
+  const highlighter = createShikiHighlighter(opts);
+  cachedHighlighters.set(key, highlighter);
+  return highlighter;
+}
+export {
+  getCachedHighlighter
+};