Add deepwiki AI documentation resource to Catalyst overview

Co-authored-by: bookernath <[email protected]>

Author: Copilot

docs/storefront/catalyst/overview.mdx

@@ -70,6 +70,7 @@ We welcome feedback in [GitHub Discussions](https://github.com/bigcommerce/catal
 
 * [🤗 BigCommerce Developer Community](/community)
 * [💬 GitHub Discussions](https://github.com/bigcommerce/catalyst/discussions)
+* [🤖 Catalyst AI Documentation](https://deepwiki.com/bigcommerce/catalyst) - Ask questions and find up-to-date architectural information
 * [GraphQL Storefront API Playground](/graphql-storefront/playground)
 * [GraphQL Storefront API Explorer](/graphql-storefront/explorer)
 * [BigCommerce DevDocs](/docs/build)