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/mdn-data/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "mdn-data",
+  "version": "2.12.2",
+  "description": "Open Web data by the Mozilla Developer Network",
+  "main": "index.js",
+  "files": [
+    "api/index.js",
+    "api/*.json",
+    "css/index.js",
+    "css/*.json",
+    "l10n/index.js",
+    "l10n/*.json"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mdn/data.git"
+  },
+  "keywords": [
+    "data",
+    "mdn",
+    "mozilla",
+    "css"
+  ],
+  "author": "Mozilla Developer Network",
+  "license": "CC0-1.0",
+  "bugs": {
+    "url": "https://github.com/mdn/data/issues"
+  },
+  "homepage": "https://developer.mozilla.org",
+  "devDependencies": {
+    "ajv": "^6.12.6",
+    "better-ajv-errors": "^1.1.2"
+  },
+  "scripts": {
+    "lint": "node test/lint",
+    "test": "npm run lint"
+  }
+}