docs(nix): remove premature flake outputs rule

docs/nix.md

@@ -195,27 +195,3 @@ Use:
 lib.mapAttrs f attrs
 ```
 
-## Flake Outputs
-
-### Expose only supported flake outputs
-
-Use public outputs for the supported interface of this flake.
-Do not expose assembly functions as public outputs unless an external consumer needs them.
-Keep internal functions in assembly files or `dotfiles` special arguments.
-
-Avoid:
-
-```nix
-{
-  lib = flake;
-  nixosConfigurations = flake.mkHosts (self + "/hosts");
-}
-```
-
-Use:
-
-```nix
-{
-  nixosConfigurations = flake.mkHosts (self + "/hosts");
-}
-```