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/is-wsl/readme.md

@@ -0,0 +1,21 @@
+# is-wsl
+
+> Check if the process is running inside [Windows Subsystem for Linux](https://msdn.microsoft.com/commandline/wsl/about) (Bash on Windows)
+
+Can be useful if you need to work around unimplemented or buggy features in WSL. Supports both WSL 1 and WSL 2.
+
+## Install
+
+```sh
+npm install is-wsl
+```
+
+## Usage
+
+```js
+import isWsl from 'is-wsl';
+
+// When running inside Windows Subsystem for Linux
+console.log(isWsl);
+//=> true
+```