feat: move to flakes

overlays/default.nix

@@ -1,16 +1,17 @@
-{ sources, system ? builtins.currentSystem, ... }@args:
+{ inputs, system ? builtins.currentSystem, ... }@args:
 
 let
-  pkgs = import sources.nixpkgs {
+  pkgs = import inputs.nixpkgs {
+    inherit system;
     overlays = [
-      (import ./nur { inherit sources; })
-      (import sources.emacs-overlay)
+      (import ./nur { inherit inputs; })
+      (import inputs.emacs-overlay)
       (import ./rustfmt)
-      (import ./dns { inherit sources; })
+      (import ./dns { inherit inputs; })
     ] ++ (map (path: import "${path}/overlay.nix") [
-      sources.arcexprs
-      sources.katexprs
-      sources.anicca
+      inputs.arcexprs
+      inputs.katexprs
+      inputs.anicca
     ]);
     config = {
       allowUnfree = true;

overlays/dns/default.nix

@@ -1,3 +1,3 @@
-{ sources, ... }: final: prev: {
-  dns = import sources.nix-dns;
+{ inputs, ... }: final: prev: {
+  dns = import inputs.nix-dns;
 }

overlays/exprs

@@ -1 +0,0 @@
-Subproject commit c5bd2b5f1bd8d08bf691abd6a1cb84fc4da300d7

overlays/nur/default.nix

@@ -1,5 +1,5 @@
-{ sources }: final: prev: {
-  nur = import sources.nur {
+{ inputs }: final: prev: {
+  nur = import inputs.nur {
     nurpkgs = final;
     pkgs = final;
   };