enable nvim and smaller config changes

modules/editors/nvim/default.nix

@@ -10,7 +10,7 @@
       enable = true;
       viAlias = true;
       vimAlias = true;
-#      defaultEditor = true;
+      vimdiffAlias = true;
 
       plugins = with pkgs.vimPlugins; [
 
@@ -34,8 +34,7 @@
         indent-blankline-nvim # Indentation lines
       ];
 
-      configure = {
-        customRC = ''
+      extraConfig = ''
           syntax enable                             " Syntax highlighting
           colorscheme srcery                        " Color scheme text
           let g:lightline = {
@@ -46,8 +45,10 @@
           
           set number                                " Set numbers
           nmap <F6> :NERDTreeToggle<CR>             " F6 opens NERDTree
-        '';
-       };
+          set expandtab
+          set shiftwidth=4
+          set tabstop=4
+      '';
     };
   };
 }