Refactor Site Builder Integration and Update Component Structure

- Removed the separate `igny8_sites` service from Docker Compose, integrating its functionality into the main app.
- Updated the Site Builder components to enhance user experience, including improved loading states and error handling.
- Refactored routing and navigation in the Site Builder Wizard and Preview components for better clarity and usability.
- Adjusted test files to reflect changes in import paths and ensure compatibility with the new structure.

frontend/src/__tests__/sites/BulkGeneration.test.tsx

@@ -4,10 +4,10 @@
  */
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { render, screen, fireEvent, waitFor } from '@testing-library/react';
-import { builderApi } from '../../../site-builder/src/api/builder.api';
+import { builderApi } from '../../../services/siteBuilder.api';
 
 // Mock API
-vi.mock('../../../site-builder/src/api/builder.api');
+vi.mock('../../../services/siteBuilder.api');
 
 describe('Bulk Generation', () => {
   beforeEach(() => {