Add npm run pages command.

This uses Cloudflare `wrangler` to serve the `_site/` folder with
support for `_headers` and `_redirects` files.

Author: BigBlueHat

package.json

@@ -4,6 +4,7 @@
   "description": "json-ld.org homepage",
   "scripts": {
     "build": "eleventy",
+    "pages": "wrangler pages dev _site/",
     "serve": "eleventy --serve",
     "watch": "eleventy --watch",
     "dev": "wrangler pages dev _site --compatibility-date=2024-04-27 --live-reload --port 8788",