Amélioration configuration Docusaurus et implémentation i18n

- Add language switcher to navbar for bilingual site (FR/EN)
- Remove intro page, use presentation as entry point
- Add example pages to all documentation categories
- Configure categories with generated-index for page listings
- Update footer and homepage links to reference presentation
- Enhance configuration with best practices:
  - Add metadata and SEO keywords
  - Enable RSS/Atom feeds for blog
  - Configure sitemap generation
  - Add syntax highlighting for YAML, HCL, Docker
  - Enable Mermaid diagram support
  - Configure table of contents settings
  - Respect user color scheme preferences
  - Add last update metadata to docs
- Fix deprecated onBrokenMarkdownLinks configuration
- Create bilingual example pages with practical code examples
- Update all i18n translations for consistency

This update brings the site in line with Docusaurus 3.x best practices
and provides a solid foundation for documentation growth.

sidebars.ts

@@ -2,34 +2,48 @@ import type {SidebarsConfig} from '@docusaurus/plugin-content-docs';
 
 const sidebars: SidebarsConfig = {
   tutorialSidebar: [
-    'intro',
     'presentation',
     {
       type: 'category',
       label: 'Notions',
       link: {
-        type: 'doc',
-        id: 'notions/index',
+        type: 'generated-index',
+        title: 'Notions',
+        description: 'Concepts et notions techniques fondamentales utilisées dans mes projets.',
+        slug: '/category/notions',
       },
-      items: [],
+      items: [
+        'notions/index',
+        'notions/exemple',
+      ],
     },
     {
       type: 'category',
       label: 'Homelab actuel - Docker Compose & Ansible',
       link: {
-        type: 'doc',
-        id: 'homelab-actuel/index',
+        type: 'generated-index',
+        title: 'Homelab actuel - Docker Compose & Ansible',
+        description: 'Documentation de mon infrastructure homelab actuelle, basée sur Docker Compose et Ansible.',
+        slug: '/category/homelab-actuel',
       },
-      items: [],
+      items: [
+        'homelab-actuel/index',
+        'homelab-actuel/exemple',
+      ],
     },
     {
       type: 'category',
       label: 'Futur Homelab - OpenTofu, K3S, Ansible & DevOps',
       link: {
-        type: 'doc',
-        id: 'homelab-futur/index',
+        type: 'generated-index',
+        title: 'Futur Homelab - OpenTofu, K3S, Ansible & DevOps',
+        description: 'Documentation de la migration vers une infrastructure moderne basée sur Kubernetes et les pratiques DevOps.',
+        slug: '/category/homelab-futur',
       },
-      items: [],
+      items: [
+        'homelab-futur/index',
+        'homelab-futur/exemple',
+      ],
     },
   ],
 };