Reset config behaviour

[holzkohlengrill]

Use -r to reset the config:

• First time you start the script with or without a path (so either you get prompted or provide the path via command line arg) the config file will be created; *What we still need is an info saying: this path will be from now on used for further runs if not stated"
• Afterwards it does not prompt until you specify a new path; Config will be updated accordingly; Important is that you cannot just delete and recreate the file but you have to update it in case we will have more options in the future
• -r will now reset the config meaning the config file will be deleted
• Alternatively we could remove the -r option and let the user delete the file by hand if neccesary

[holzkohlengrill]

The file modification will be skipped for now. In the future this could be done by updating and rewriting a JSON file (-> dict). fyi @DariaPigasova