Update index.md adding cloud extension aws-ai

Author: robfatland

cloud/index.md

@@ -19,6 +19,7 @@ concern cloud consumer services such as iCloud and Google Drive.
 - [studies](https://github.com/robfatland/nexus/blob/gh-pages/cloud/studies.md)
 - [organizations](https://github.com/robfatland/nexus/blob/gh-pages/cloud/organizations.md)
 - [aws](https://github.com/robfatland/nexus/blob/gh-pages/cloud/aws.md)
+- [aws ai](https://github.com/robfatland/nexus/blob/gh-pages/cloud/aws-ai.md)
 - [azure]()
 - [gcp]()