Add information about AI

[awurno]

We need explanation about how to use AI in positron

There is some functionality that can be enabled. For more info see: https://www.youtube.com/watch?v=Y9P2nlFXKnQ

We need info on

• how to enable but also how to disable.
• What is agentic and why we don't want students to use it (privacy, don't upload (read) files unwanted)
• maybe something about cli integration, and that we don't want them to use that