chore: fix docs deployment (#13988)

* chore: fix docs deployment

* Update sites/svelte.dev/package.json

Co-authored-by: Conduitry <git@chor.date>

* Update sites/svelte.dev/package.json

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Conduitry <git@chor.date>

sites/svelte.dev/package.json

@@ -5,8 +5,8 @@
   "description": "Docs and examples for Svelte",
   "type": "module",
   "scripts": {
-    "dev": "node scripts/update.js && vite dev",
-    "build": "node scripts/update.js && vite build",
+    "dev": "node scripts/update.js && pnpm run generate && vite dev",
+    "build": "node scripts/update.js && pnpm run generate && vite build",
     "generate": "node scripts/type-gen/index.js",
     "update": "node scripts/update.js --force=true",
     "preview": "vite preview",