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.

docs/homelab-futur/exemple.md

@@ -0,0 +1,153 @@
+---
+sidebar_position: 2
+---
+
+# Exemple
+
+Ceci est une page d'exemple dans la catégorie Futur Homelab.
+
+## Description
+
+Cette page démontre comment documenter les configurations et déploiements Kubernetes du futur homelab.
+
+## Déploiement Kubernetes
+
+Exemple de manifeste pour un déploiement :
+
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: exemple-app
+  namespace: production
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: exemple
+  template:
+    metadata:
+      labels:
+        app: exemple
+    spec:
+      containers:
+      - name: app
+        image: nginx:latest
+        ports:
+        - containerPort: 80
+        resources:
+          limits:
+            cpu: 100m
+            memory: 128Mi
+          requests:
+            cpu: 50m
+            memory: 64Mi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: exemple-service
+  namespace: production
+spec:
+  selector:
+    app: exemple
+  ports:
+  - port: 80
+    targetPort: 80
+  type: ClusterIP
+```
+
+## Configuration OpenTofu
+
+Exemple de ressource infrastructure :
+
+```hcl
+resource "kubernetes_namespace" "production" {
+  metadata {
+    name = "production"
+    labels = {
+      environment = "production"
+      managed-by  = "opentofu"
+    }
+  }
+}
+
+resource "kubernetes_deployment" "exemple" {
+  metadata {
+    name      = "exemple-app"
+    namespace = kubernetes_namespace.production.metadata[0].name
+  }
+
+  spec {
+    replicas = 3
+
+    selector {
+      match_labels = {
+        app = "exemple"
+      }
+    }
+
+    template {
+      metadata {
+        labels = {
+          app = "exemple"
+        }
+      }
+
+      spec {
+        container {
+          image = "nginx:latest"
+          name  = "app"
+
+          resources {
+            limits = {
+              cpu    = "100m"
+              memory = "128Mi"
+            }
+            requests = {
+              cpu    = "50m"
+              memory = "64Mi"
+            }
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+## GitOps avec ArgoCD
+
+Configuration ArgoCD Application :
+
+```yaml
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: exemple-app
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://forgejo.tellserv.fr/Tellsanguis/k8s-manifests.git
+    targetRevision: HEAD
+    path: apps/exemple
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: production
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+    - CreateNamespace=true
+```
+
+## Observabilité
+
+Points de surveillance pour ce service :
+
+- Métriques Prometheus exposées sur `/metrics`
+- Logs agrégés dans Loki
+- Traces distribuées avec Tempo
+- Alertes configurées dans Prometheus AlertManager