add dhall support

config/programs/vim/modules/languages/default.nix

@@ -98,6 +98,7 @@ with lib; {
     nvim-lspconfig
     lsp_extensions-nvim
     lsp-status-nvim
+    dhall-vim
   ];
 
   output.path.path = with pkgs; [
@@ -112,6 +113,9 @@ with lib; {
     # C++
     clang-tools
 
+    # Dhall
+    dhall-lsp-server
+
     # Python
     (writeScriptBin "pyright-langserver" ''
       # pyright has a symlinked `./bin` which breaks Nix's `symlinkJoin`