Nixos flake support

[anarion80]

Clear and concise description of the problem

Somewhere down the line it would be great to have nix flake support for easy install on Nixos.

Example from Caelestia shell: https://github.com/caelestia-dots/shell/blob/main/flake.nix

Suggested solution

Example from Caelestia shell: https://github.com/caelestia-dots/shell/blob/main/flake.nix

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[S4NKALP]

Thank you for opening this issue. I am not familiar with Nix, so I cannot implement Flake support myself. If you can create a PR, it would be greatly appreciated.