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/prismjs/components/prism-hsts.js

@@ -0,0 +1,14 @@
+/**
+ * Original by Scott Helme.
+ *
+ * Reference: https://scotthelme.co.uk/hsts-cheat-sheet/
+ */
+
+Prism.languages.hsts = {
+	'directive': {
+		pattern: /\b(?:includeSubDomains|max-age|preload)(?=[\s;=]|$)/i,
+		alias: 'property'
+	},
+	'operator': /=/,
+	'punctuation': /;/
+};