feat(flake): modular structure with flake-file and flake-parts

flake/inputs/core.nix

@@ -0,0 +1,30 @@
+# Core Inputs
+
+/**
+  Essential inputs that form
+  the foundation of the NixOS configuration
+*/
+{
+  /**
+    The Core of NixOS, providing packages and modules.
+    Points to `nixos-unstable` branch for latest features an updates
+  */
+  nixpkgs = {
+    url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  /**
+    A modular flake framework that simplifies flake organizing
+    and reduces boilerplate code.
+  */
+  flake-parts = {
+    url = "github:hercules-ci/flake-parts";
+  };
+
+  /**
+    Like flake-parts, but for flake inputs
+  */
+  flake-file = {
+    url = "github:vic/flake-file";
+  };
+}