Better behaviour if application config folder not exist

[helto4real]

The problem

If users do not have yaml config they should not use .AddNetDaemonAppSettings() in program.cs. ND should log a warning that no yaml files exists or folder does not exist and suggest remove the .AddNetDaemonAppSettings()

Environment

• NetDaemon release with the issue:
• Last working NetDaemon release (if known):
• Operating environment (Home assistant Add-on/Docker/Dev setup):
• Link to integration documentation on our website:

Link to or paste code that causes the issue

Traceback/Error logs

Additional information

[helto4real]

Wont fix