use ripgrep for external grep in neovim as well

nvim/.config/nvim/init.lua

@@ -27,6 +27,8 @@ vim.cmd [=[
     set noswapfile
     set list
     set tags+=~/tags
+    set grepprg=rg\ --vimgrep\ --hidden\ --smart-case
+    set grepformat=%f:%l:%c:%m
 
     nnoremap ,co :copen<CR>
     nnoremap ,cc :cclose<CR>