Adding a new guide on optimizing for generative AI features

What : Added a new guide on optimizing for generative AI features on Search. Notable new sections include guidance on the importance of providing non-commodity content, tips about providing local, shopping, image, and video content, mythbusting common “AEO/GEO” misconceptions, initial guidance on AI agents, and more information on why SEO best practices continue to be relevant for success in our generative AI features on Search. Why : To help site owners, SEOs, and developers better understand how to optimize their content for appearance in generative AI features on Search, and what they can i