feat(prerender): add 'Neuheiten' category and update data fetching logic

- Introduce a new category 'Neuheiten' to the rendering process by appending it to the existing categories.
- Modify the data fetching logic to handle the 'neu' category ID correctly.
- Enhance the UI by adding a button for the 'Neuheiten' category in the CategoryList component, complete with styling and internationalization support.

prerender.cjs

@@ -525,7 +525,14 @@ const renderApp = async (categoryData, socket) => {
     let categoryPagesRendered = 0;
     let categoriesWithProducts = 0;
 
-    for (const category of allCategories) {
+    const allCategoriesPlusNeu = [...allCategories, {
+      id: "neu",
+      name: "Neuheiten",
+      seoName: "neu",
+      parentId: 209
+    }];
+
+    for (const category of allCategoriesPlusNeu) {
       // Skip categories without seoName
       if (!category.seoName) {
         console.log(