feat: scaffold Astro project with en/fr i18n routing

Sets output to static (Astro default) with path-based i18n routing
(/en/, /fr/) and no unprefixed default-locale route, per the hub
landing page design spec.

.gitignore

@@ -0,0 +1,24 @@
+# build output
+dist/
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# jetbrains setting folder
+.idea/