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add delete functionality

This is slightly hacky. See https://stackoverflow.com/questions/52339336/removal-of-key-value-pair-from-viper-config-file

> TLDR; This is dangerous and doesn't work. This method doesn't work in tricky ways. If you viper.Set a key at all for the path then the viper.Get will return the map from the override list, which then won't let you delete any keys in the config list. So if your app adds and removes things, you may find it fails to delete with this method. –
[Will Brode](https://stackoverflow.com/users/1139197/will-brode)
 Commented May 11, 2023 at 7:29

In our specific use case, it seems to work just fine.