Update contributor guidelines to cover the use of AI

[AmnestyAM]

Our contrubutor guidlines should refelct our publications on the use of AI.

https://www.amnesty.org/en/latest/news/2026/05/global-enormous-data-pipelines-powering-major-generative-ai-systems-are-rooted-in-mass-invasions-of-privacy-by-design/

https://www.amnesty.org/en/documents/ior40/0447/2025/en/

https://www.amnesty.org/en/latest/campaigns/2024/01/the-urgent-but-difficult-task-of-regulating-artificial-intelligence/

They should also refelct that there are many diffent typers of AI tools and levels of human interaction with these tools, that these tools will be used, what specificaly cannot be used, and what will heppen if used.