Improve project structure.

New Project Structure:
  - Created reusable UI components (ServiceCard, AnimatedSection, SectionTitle)
  - Split large components into smaller, focused ones
  - Extracted shared hooks for common functionality
  - Organized constants into separate files

Key Improvements:
  - Hooks: useScrollNavigation, useScrollToSection, useCookieSettings
  - UI Components: Modular components for consistent styling and behavior
  - Constants: Centralized data management (ServicesData, NavigationData)
  - Component Split: Navbar, Hero, and Footer broken into logical sub-components

frontend/constant/NavigationData.ts

@@ -0,0 +1,13 @@
+export interface NavLink {
+    id: string;
+    label: string;
+}
+
+export const navLinks: NavLink[] = [
+    { id: 'services', label: 'Leistungen' },
+    { id: 'about', label: 'Über uns' },
+    { id: 'process', label: 'Ablauf' },
+    { id: 'whyus', label: 'Warum wir' },
+    { id: 'referral', label: 'Empfehlung' },
+    { id: 'faq', label: 'FAQ' },
+];