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/http-cache-semantics/package.json

@@ -0,0 +1,22 @@
+{
+    "name": "http-cache-semantics",
+    "version": "4.2.0",
+    "description": "Parses Cache-Control and other headers. Helps building correct HTTP caches and proxies",
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/kornelski/http-cache-semantics.git"
+    },
+    "main": "index.js",
+    "types": "index.js",
+    "scripts": {
+        "test": "mocha"
+    },
+    "files": [
+        "index.js"
+    ],
+    "author": "Kornel Lesiński <npms2@geekhood.net> (https://kornel.ski/)",
+    "license": "BSD-2-Clause",
+    "devDependencies": {
+        "mocha": "^11.0"
+    }
+}