Defaulting to not installing custom config in --headless mode (#2132)

* Defaulting to not installing custom config in --headless mode

* Update bootstrap.lua

---------

Co-authored-by: siduck <siduck@tutanota.com>

lua/core/bootstrap.lua

@@ -33,7 +33,11 @@ end
 M.gen_chadrc_template = function()
   if not vim.api.nvim_get_runtime_file("lua/custom/chadrc.lua", false)[1] then
     local path = vim.fn.stdpath "config" .. "/lua/custom/"
-    local input = vim.fn.input "Do you want to install example custom config? (y/N) : "
+    local input = "N"
+
+    if next(vim.api.nvim_list_uis()) then
+      input = vim.fn.input "Do you want to install example custom config? (y/N) : "
+    end
 
     -- clone example_config repo
     if input == "y" then