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/css-tree/cjs/syntax/node/NestingSelector.cjs

@@ -0,0 +1,29 @@
+'use strict';
+
+const types = require('../../tokenizer/types.cjs');
+
+const AMPERSAND = 0x0026;       // U+0026 AMPERSAND (&)
+
+const name = 'NestingSelector';
+const structure = {
+};
+
+function parse() {
+    const start = this.tokenStart;
+
+    this.eatDelim(AMPERSAND);
+
+    return {
+        type: 'NestingSelector',
+        loc: this.getLocation(start, this.tokenStart)
+    };
+}
+
+function generate() {
+    this.token(types.Delim, '&');
+}
+
+exports.generate = generate;
+exports.name = name;
+exports.parse = parse;
+exports.structure = structure;