NixOS Team Onboarding Resources

1st chunk of `maintainers/onboarding.md`

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# Onboarding a new team member

- https://github.com/NixOS/nixos-homepage/
- https://github.com/orgs/NixOS/teams/nix-team
- Matrix rooms
  - [private] Nix maintainer team
  - Nix ∪ Lix devs (also private)
  - any open security issues if present and needed

- Team member should subscribe to notifications for the [Nix development category on Discourse](https://discourse.nixos.org/c/dev/nix/50)

Title: NixOS Team Onboarding Resources

Summary

This chunk outlines essential resources for onboarding a new team member to the NixOS project. It includes links to the NixOS homepage and the Nix team on GitHub, mentions specific private Matrix chat rooms ('Nix maintainer team' and 'Nix ∪ Lix devs'), notes the importance of any open security issues, and advises subscribing to notifications for the Nix development category on Discourse.