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/@oslojs/encoding/README.md

@@ -0,0 +1,23 @@
+# @oslojs/encoding
+
+**Documentation: https://encoding.oslojs.dev**
+
+A JavaScript library for encoding and decoding data with hexadecimal, base32, base64, and base64url encoding schemes based on [RFC 4648](https://datatracker.ietf.org/doc/html/rfc4648). Implementations may be stricter than most to follow the RFC as close as possible.
+
+- Runtime-agnostic
+- No third-party dependencies
+- Fully typed
+
+```ts
+import { encodeBase64, decodeBase64 } from "@oslojs/encoding";
+
+const data: Uint8Array = new TextEncoder().encode("hello world");
+const encoded = encodeBase64(data);
+const decoded = decodeBase64(encoded);
+```
+
+## Installation
+
+```
+npm i @oslojs/encoding
+```