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-brainfuck.js

@@ -0,0 +1,20 @@
+Prism.languages.brainfuck = {
+	'pointer': {
+		pattern: /<|>/,
+		alias: 'keyword'
+	},
+	'increment': {
+		pattern: /\+/,
+		alias: 'inserted'
+	},
+	'decrement': {
+		pattern: /-/,
+		alias: 'deleted'
+	},
+	'branching': {
+		pattern: /\[|\]/,
+		alias: 'important'
+	},
+	'operator': /[.,]/,
+	'comment': /\S+/
+};