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/.vitepress/data/presentations.json

@@ -0,0 +1,30 @@
+[
+  {
+    "slug": "kubernetes-operators",
+    "title": "Kubernetes Operators — De l’enfer au paradis",
+    "description": "Mental model (API, etcd, boucle), controllers et opérateurs, exemples concrets (Reflector, Reloader, cert-manager, Postgres) et pièges à éviter.",
+    "tags": [
+      "kubernetes",
+      "operators",
+      "devops",
+      "controllers"
+    ],
+    "order": 1,
+    "featured": true,
+    "folder": "kubernetes-operators"
+  },
+  {
+    "slug": "spring-ai",
+    "title": "Spring AI",
+    "description": "Intégrer des modèles LLM dans l’écosystème Spring avec des API cohérentes.",
+    "tags": [
+      "java",
+      "spring",
+      "llm",
+      "ai"
+    ],
+    "order": 2,
+    "featured": true,
+    "folder": "spring-ai"
+  }
+]