Creating a community nix config repository

### Idea
Create community nix config repo (as suggested in LUP 555)

### Summary
Hello everyone! I am a nix-passionate Linux nerd looking to contribute to the Jupiter Broadcasting community, and I would love to help contribute to this repo to create a community nix configuration repository. I run nixos on my main system and would've really benefited from something like this when I started. There are just so many ways to do things! I was thinking we could do something like everyone having a directory for their configurations, possibly using their github username as a name, and a docs.md file alongside their configs. It could explain anything special about the configs or anything they are working on. Please let me know if you or anyone else is interested. Thank you!