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/iron-webcrypto/dist/example.js

@@ -0,0 +1,19 @@
+const { webcrypto } = require('node:crypto')
+const Iron = require('iron-webcrypto')
+
+const obj = {
+  a: 1,
+  b: 2,
+  c: [3, 4, 5],
+  d: {
+    e: 'f'
+  }
+}
+
+const password = 'a_password_having_at_least_32_chars'
+
+const sealed = await Iron.seal(webcrypto, obj, password, Iron.defaults)
+console.log({ sealed })
+
+const unsealed = await Iron.unseal(webcrypto, sealed, password, Iron.defaults)
+console.log({ unsealed })