Adding Content-Signal to a docs site

A few weeks ago I ran isagentready.com on docs.expo.dev, a site that I manage and work on, for my day job. One of the failed references during the check was the lack of Content-Signal policy in robots.txt file of the site. Just for context, isagentsready.com is a tool that checks if a site is ready for AI agents to crawl and index, and is developed by Cloudflare.