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.

server/nginx/default.conf

@@ -1,12 +0,0 @@
-server {
-    listen 8080;
-    server_name localhost;
-    # Racine web = contenu statique sparse (dossier content/ du dépôt).
-    root /usr/share/nginx/html/content;
-    index index.html index.htm;
-
-    location / {
-        add_header Cache-Control "no-cache";
-        try_files $uri $uri/ =404;
-    }
-}