Remplacement diagrammes PDF par PNG, ajout note Docker Swarm, traductions complètes

- Replace PDF diagrams with PNG images for inline display in docs
- Add infrastructure diagram to Homelab actuel category page
- Add network diagram to single-machine HA homelab page
- Add Docker Swarm vs Kubernetes decision note in docker-compose page
- Complete English translations for homepage tagline
- Translate homepage tagline dynamically using Docusaurus i18n
- Remove PDF diagram files from static assets (homelab-actuel-infra.pdf, homelab-futur-network.pdf)
- Add new documentation pages: Docker Compose, Ansible playbooks, Traefik
- Add Future Homelab pages: single-machine HA and 3-node Proxmox cluster
- Remove example pages and notions category
- Update sidebar configuration

src/pages/index.tsx

@@ -16,7 +16,13 @@ function HomepageHeader() {
         <Heading as="h1" className="hero__title">
           {siteConfig.title}
         </Heading>
-        <p className="hero__subtitle">{siteConfig.tagline}</p>
+        <p className="hero__subtitle">
+          <Translate
+            id="homepage.tagline"
+            description="The homepage tagline">
+            Recherches et réflexions sur les défis techniques
+          </Translate>
+        </p>
         <div className={styles.buttons}>
           <Link
             className="button button--secondary button--lg"