Add haskell-language-server

config.nix

@@ -160,6 +160,12 @@
         markdown_oxide.enable = true;
 
         ltex.enable = true;
+
+        # haskell-language-server
+        hls = {
+          enable = true;
+          installGhc = false;
+        };
       };
     };
   };
@@ -174,6 +180,8 @@
       name = "typst-preview";
       src = inputs.typst-preview;
     })
+
+    pkgs.vimPlugins.haskell-tools-nvim
   ];
 
   extraConfigLua = ''