Add demo video for providing/robots.txt route from site settings

Author: domonkosgabor

src/docs/reference/modules/Seo/README.md

@@ -27,3 +27,5 @@ These default settings aim to provide a basic configuration that ensures search
 ## Video
 
 <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/bDf96bg-mBU" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/IchtAdYQF7g" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>