Improve error handling for menu data fetching and update HTML structure: Enhance error logging in menuDataController, provide user-friendly error messages, and streamline the index.html file by adding new script references while removing an unused image.

controllers/menuDataController.js

@@ -6,7 +6,8 @@ exports.getMenuData = async (req, res) => {
     const menuData = await fetchMenuData();
     res.json(menuData);
   } catch (error) {
-    res.status(500).send('Error fetching menu data');
+    console.error('getMenuData:', error);
+    res.status(500).json({ error: 'Menü konnte nicht geladen werden (Datenbank nicht erreichbar).' });
   }
 };