check if a site is hosted on netlify by just prepending "http://is-this.netlify.app" in front of any url
examples:
- https://is-this.netlify.app/barstoolsports.com
- https://is-this.netlify.app/https://copaamerica.com
- https://is-this.netlify.app/www.reactjs.org/hooks
Want this functionality in your desktop browser? https://github.com/netlify/netlify-browser-extension