refactor: complete overhaul

parts/default.nix

@@ -5,10 +5,16 @@
     config,
     self',
     ...
-  }: {
-    imports = [
-      ./devshells.nix
-      ./pre-commit.nix
-    ];
+  }: let
+    configPath = ./config;
+
+    devshellImports = let
+      files = builtins.attrNames (builtins.readDir configPath);
+    in
+      map
+      (name: configPath + "/${name}")
+      (builtins.filter (name: builtins.match ".*\\.nix$" name != null) files);
+  in {
+    imports = devshellImports;
   };
 }