Make clear where config.yaml is being read from

[nstelter-slac]

was bit tricky to find which settings config file my Badger was reading from by default (/home/nolan/.config/config.yaml for me)

could we mention this in the docs, and display the curr config file in gui somewhere with option to set new path?

also if i pass an empty config file to Badger by running badger -g -cf empty.yaml, i get the following error:

Traceback (most recent call last):
  File "/home/nolan/miniforge3/envs/badger-env/bin/badger", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/nolan/repos/Badger/src/badger/__main__.py", line 136, in main
    args.func(args)
  File "/home/nolan/repos/Badger/src/badger/actions/__init__.py", line 16, in show_info
    if check_n_config_paths(args.config_filepath):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nolan/repos/Badger/src/badger/actions/doctor.py", line 36, in check_n_config_paths
    config = init_settings(config_filepath)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nolan/repos/Badger/src/badger/settings.py", line 406, in init_settings
    config_singleton = ConfigSingleton(file_path, user_flag)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nolan/repos/Badger/src/badger/settings.py", line 114, in __new__
    cls._instance._config = cls.load_or_create_config(config_path)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nolan/repos/Badger/src/badger/settings.py", line 140, in load_or_create_config
    for key, value in config_data.items():
                      ^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'items

in this situation, could we write the default config values into the empty file?