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.

playwright.config.mjs

@@ -0,0 +1,33 @@
+import { defineConfig, devices } from '@playwright/test'
+
+const port = Number(process.env.PW_PORT || 4174)
+const baseURL = `http://127.0.0.1:${port}`
+
+const skipWebServer = !!process.env.PW_SKIP_WEBSERVER
+
+export default defineConfig({
+  testDir: 'e2e',
+  timeout: 60_000,
+  expect: { timeout: 15_000 },
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 1 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: [['list'], ['html', { open: 'never' }]],
+  use: {
+    baseURL,
+    trace: 'on-first-retry',
+    ...devices['Desktop Chrome'],
+  },
+  projects: [{ name: 'chromium', use: {} }],
+  webServer: skipWebServer
+    ? undefined
+    : {
+        command: `npm run build && PREVIEW_PORT=${port} node tools/static-preview.mjs`,
+        url: baseURL,
+        reuseExistingServer: !process.env.CI,
+        timeout: 300_000,
+        stdout: 'pipe',
+        stderr: 'pipe',
+      },
+})