vanadium: move language server to environment

nix/configurations/vanadium/home/dev.nix

@@ -9,30 +9,6 @@
     pkgs.python3Packages.grip
   ];
 
-  programs.neovim.extraPackages = [
-    # lua
-    pkgs.lua-language-server
-    pkgs.stylua
-
-    pkgs.nil # nix
-    pkgs.yaml-language-server # yaml
-
-    pkgs.pyright # python
-
-    pkgs.marksman # markdown
-    pkgs.taplo # toml
-    pkgs.lemminx # xml
-    # pkgs.texlab # latex
-
-    pkgs.vscode-langservers-extracted # JSON etc
-
-    # fish
-    pkgs.fish-lsp
-
-    # spellchecking
-    pkgs.myPkgs.ltex-ls-plus
-  ];
-
   programs.git = {
     enable = true;
     signing.signByDefault = true;