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/diff/libesm/convert/dmp.d.ts

@@ -0,0 +1,8 @@
+import type { ChangeObject } from '../types.js';
+type DmpOperation = 1 | 0 | -1;
+/**
+ * converts a list of change objects to the format returned by Google's [diff-match-patch](https://github.com/google/diff-match-patch) library
+ */
+export declare function convertChangesToDMP<ValueT>(changes: ChangeObject<ValueT>[]): [DmpOperation, ValueT][];
+export {};
+//# sourceMappingURL=dmp.d.ts.map