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/github-slugger/index.d.ts

@@ -0,0 +1,43 @@
+/**
+ * Generate a slug.
+ *
+ * Does not track previously generated slugs: repeated calls with the same value
+ * will result in the exact same slug.
+ * Use the `GithubSlugger` class to get unique slugs.
+ *
+ * @param  {string} value
+ *   String of text to slugify
+ * @param  {boolean} [maintainCase=false]
+ *   Keep the current case, otherwise make all lowercase
+ * @return {string}
+ *   A unique slug string
+ */
+export function slug(value: string, maintainCase?: boolean | undefined): string;
+/**
+ * Slugger.
+ */
+export default class BananaSlug {
+    /** @type {Record<string, number>} */
+    occurrences: Record<string, number>;
+    /**
+     * Generate a unique slug.
+    *
+    * Tracks previously generated slugs: repeated calls with the same value
+    * will result in different slugs.
+    * Use the `slug` function to get same slugs.
+     *
+     * @param  {string} value
+     *   String of text to slugify
+     * @param  {boolean} [maintainCase=false]
+     *   Keep the current case, otherwise make all lowercase
+     * @return {string}
+     *   A unique slug string
+     */
+    slug(value: string, maintainCase?: boolean | undefined): string;
+    /**
+     * Reset - Forget all previous slugs
+     *
+     * @return void
+     */
+    reset(): void;
+}