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/boolbase/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "boolbase",
+  "version": "1.0.0",
+  "description": "two functions: One that returns true, one that returns false",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/fb55/boolbase"
+  },
+  "keywords": [
+    "boolean",
+    "function"
+  ],
+  "author": "Felix Boehm <me@feedic.com>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/fb55/boolbase/issues"
+  },
+  "homepage": "https://github.com/fb55/boolbase"
+}