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-inside-container/readme.md

@@ -0,0 +1,36 @@
+# is-inside-container
+
+> Check if the process is running inside a container
+
+## Install
+
+```sh
+npm install is-inside-container
+```
+
+## Usage
+
+```js
+import isInsideContainer from 'is-inside-container';
+
+if (isInsideContainer()) {
+	console.log('Running inside a container');
+}
+```
+
+## CLI
+
+```sh
+is-inside-container
+```
+
+Exits with code 0 if inside a container and 2 if not.
+
+## Supported containers
+
+- Docker
+- Podman
+
+## Related
+
+- [is-docker](https://github.com/sindresorhus/is-docker) - Check if the process is running inside a Docker container