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.

i18n/en/docusaurus-plugin-content-docs/current/homelab-actuel/exemple.md

@@ -0,0 +1,60 @@
+---
+sidebar_position: 2
+---
+
+# Example
+
+This is an example page in the Current Homelab category.
+
+## Description
+
+This page demonstrates how to document a service or configuration of the current homelab.
+
+## Docker Compose Configuration
+
+Example service configuration:
+
+```yaml
+version: '3.8'
+
+services:
+  example-service:
+    image: nginx:latest
+    container_name: example
+    ports:
+      - "8080:80"
+    volumes:
+      - ./config:/etc/nginx/conf.d
+    restart: unless-stopped
+```
+
+## Ansible Playbook
+
+Deployment example with Ansible:
+
+```yaml
+---
+- name: Deploy example service
+  hosts: homelab
+  become: yes
+
+  tasks:
+    - name: Copy docker-compose file
+      copy:
+        src: docker-compose.yml
+        dest: /opt/example/docker-compose.yml
+
+    - name: Start the service
+      command: docker-compose up -d
+      args:
+        chdir: /opt/example
+```
+
+## Maintenance
+
+Important maintenance points:
+
+- Regular backups
+- Docker image updates
+- Log monitoring
+- Restore testing