move stuff to parts dir

.envrc

@@ -1,2 +1,2 @@
 use flake
-watch_file dev.nix
+watch_file parts/dev.nix

flake.nix

@@ -55,9 +55,7 @@
       systems = ["x86_64-linux"];
 
       imports = [
-        ./ci.nix
-        ./dev.nix
-        ./deploy.nix
+        ./parts
         ./systems
       ];
     };

parts/ci.nix

@@ -10,7 +10,7 @@
     ...
   }: {
     packages = let
-      overlay = lib.fix (final: (import ./exprs/overlay.nix final pkgs));
+      overlay = lib.fix (final: (import ../exprs/overlay.nix final pkgs));
 
       # do not include a package if it's not available on the system or if it's broken
       isValid = _: v:

parts/default.nix

@@ -0,0 +1,7 @@
+{
+  imports = [
+    ./ci.nix
+    ./deploy.nix
+    ./dev.nix
+  ];
+}