Update frequently-asked-questions.mdx (#22609)

Added reference to adding Turnstile to sites not proxied by Cloudflare as mentioned in the overview page.

Author: michelbamps

src/content/docs/turnstile/frequently-asked-questions.mdx

@@ -27,4 +27,10 @@ Yes, Turnstile is WCAG 2.1 Level AA compliant.
 
 ## Where can I get additional support for Turnstile?
 
-Refer to the [Cloudflare Community](https://community.cloudflare.com/c/website-application-performance/turnstile/83) or join the [Cloudflare Developers Discord server](https://discord.com/channels/595317990191398933/1025131875397812224).
+Refer to the [Cloudflare Community](https://community.cloudflare.com/c/website-application-performance/turnstile/83) or join the [Cloudflare Developers Discord server](https://discord.com/channels/595317990191398933/1025131875397812224).
+
+---
+
+## Can I use Turnstile in websites not proxied by Cloudflare?
+
+Turnstile can be embedded into any website without sending traffic through Cloudflare and works without showing visitors a CAPTCHA.