Expand Code of Conduct to prohibit inciting violence and proselytising (#15270)
The code of conduct currently prohibits explicitly violent language, but has no statement on inciting violence.
Inciting, encouraging or otherwise glorifying violence is materially not much different to violence itself.
Prohibiting inciting violence is a common standard on social media platforms, and is also prohibited on GitHub itself
This PR adds an explicit ban on inciting or glorifying violence to the code of conduct.
This PR also adds an explicit ban on religious and political proselytising.