[NixOS] Add kotlin language server

nixos/code.nix

@@ -46,6 +46,10 @@ makeEnable config "myModules.code" true {
     poetry
     black
 
+    # kotlin
+    kotlin
+    kotlin-language-server
+
     # dhall
     haskellPackages.dhall
     haskellPackages.dhall-json

nixos/overlay.nix

@@ -62,8 +62,6 @@ final: prev: {
         pip
         requests
         tox
-        virtualenv
-        virtualenvwrapper
       ];
   in
     final.python311.withPackages my-python-packages;