nix: refactor neovim presets into modules

nix/homeModules/common/neovim.nix

@@ -6,39 +6,14 @@
 }:
 
 {
-  options.programs.neovim.extraLangServers = {
-    enable = lib.mkEnableOption "miscellaneous language servers";
-  };
-
   config = {
     programs.neovim = {
       defaultEditor = true;
-      extraPackages = lib.mkMerge [
-
-        # might be useful for servers
-        [
-          # shell
-          pkgs.nodePackages.bash-language-server
-          pkgs.shellcheck
-          pkgs.shfmt
-        ]
-
-        (lib.mkIf config.programs.neovim.extraLangServers.enable [
-          # lua
-          pkgs.lua-language-server
-          pkgs.stylua
-
-          pkgs.nil # nix
-          pkgs.yaml-language-server # yaml
-
-          pkgs.nodePackages.pyright # python
-
-          pkgs.marksman # markdown
-          pkgs.taplo # toml
-          pkgs.lemminx # xml
-          # pkgs.texlab # latex
-        ])
-
+      extraPackages = [
+        # might be useful for servers, serves as minimal configuration
+        pkgs.nodePackages.bash-language-server
+        pkgs.shellcheck
+        pkgs.shfmt
       ];
     };