Add Makefile, package.json, and initial configuration for VitePress and Slidev integration

- Introduced a Makefile for streamlined commands related to building, running, and managing presentations.
- Created package.json to define project metadata, dependencies, and scripts for development and testing.
- Added .gitignore entries to exclude build artifacts and temporary files from version control.
- Included playwright.config.mjs for end-to-end testing setup with Playwright.
- Added README.md for project documentation, outlining setup instructions and development guidelines.

portal/presentations/kubernetes-operators/index.md

@@ -0,0 +1,29 @@
+---
+title: Kubernetes Operators — De l’enfer au paradis
+outline: deep
+---
+
+# Kubernetes Operators — De l’enfer au paradis
+
+**Tags :** `kubernetes` · `operators` · `devops` · `controllers`
+
+## Résumé
+
+Mental model (API, etcd, boucle), controllers et opérateurs, exemples concrets (Reflector, Reloader, cert-manager, Postgres) et pièges à éviter.
+
+## Accès
+
+<p class="pres-actions">
+  <a class="vp-button vp-raw" href="/slides/kubernetes-operators/1">Voir les slides</a>
+  <a class="vp-button vp-button--alt vp-raw" href="/slides/kubernetes-operators/1" target="_blank" rel="noopener noreferrer">Ouvrir dans un nouvel onglet</a>
+</p>
+
+## Partager les slides
+
+Depuis la salle, scannez le code pour ouvrir les slides sur mobile.
+
+<QrEncode path="/slides/kubernetes-operators/1" />
+
+::: info À propos
+Les slides sont servies en SPA statique (Slidev). Les chemins d’assets suivent le `base` défini au build.
+:::