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.

tools/build-deck.mjs

@@ -0,0 +1,69 @@
+#!/usr/bin/env node
+/**
+ * Build Slidev pour un slug → dossier dist-<slug>/ à la racine du dépôt.
+ * Usage : node tools/build-deck.mjs <slug>
+ */
+import fs from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { execFileSync } from 'node:child_process'
+import { sitePath } from './site-base.mjs'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const root = path.resolve(__dirname, '..')
+
+function publishBuild(wipDir, finalDir) {
+  fs.mkdirSync(finalDir, { recursive: true })
+  fs.cpSync(wipDir, finalDir, { recursive: true, force: true })
+  fs.rmSync(wipDir, { recursive: true, force: true })
+}
+
+function slidevBin() {
+  const p = path.join(root, 'node_modules', '.bin', 'slidev')
+  if (fs.existsSync(p)) return p
+  return 'slidev'
+}
+
+const slug = process.argv[2]
+if (!slug || slug.startsWith('wip_')) {
+  console.error('usage: node tools/build-deck.mjs <slug>')
+  process.exit(1)
+}
+
+const entry = path.join(root, 'slides', slug, 'slides.md')
+const metaPath = path.join(root, 'slides', slug, 'meta.json')
+if (!fs.existsSync(entry) || !fs.existsSync(metaPath)) {
+  console.error(`[build-deck] slides/${slug}/ incomplet (slides.md + meta.json requis)`)
+  process.exit(1)
+}
+
+const finalDir = path.join(root, `dist-${slug}`)
+const wipDir = path.join(root, '.slide-wip', slug)
+const base = sitePath(`/slides/${slug}/`)
+if (!base.endsWith('/')) throw new Error(`base invalide: ${base}`)
+
+fs.rmSync(wipDir, { recursive: true, force: true })
+fs.mkdirSync(wipDir, { recursive: true })
+/* Ne pas supprimer slides/<slug>/index.html avant le build : Slidev s’attend à pouvoir unlink ce fichier en fin de build. */
+console.log(`[build-deck] ${slug} → dist-${slug}/ (base=${base})`)
+try {
+  execFileSync(
+    slidevBin(),
+    ['build', entry, '--out', wipDir, '--base', base],
+    { stdio: 'inherit', cwd: root, env: process.env },
+  )
+  publishBuild(wipDir, finalDir)
+  /* Slidev peut écrire un index.html à côté de slides.md — inutile et bruyant au build suivant */
+  try {
+    fs.rmSync(path.join(root, 'slides', slug, 'index.html'), { force: true })
+  } catch {
+    /* ignore */
+  }
+} catch (e) {
+  try {
+    fs.rmSync(wipDir, { recursive: true, force: true })
+  } catch {
+    /* ignore */
+  }
+  process.exit(1)
+}