Add NFs config.yaml as a independent file

[fhgrings]

Desagragated NFs config files from values.yaml to easiest manipulation when working with multiple slices and deployments

• Created a config.yaml file for each function that requires it
• Removed configuration.configuration value from values.yaml
• Replaced config-map.yaml to read a file

[raoufkh]

Thank you @fhgrings for this suggestion. However, the idea behind putting the conf in the values.yaml file is to avoid hardcoding and make helm charts more easily reusable. With Helm, it's possible to reuse exactly the same Helm chart for several possible scenarios by customizing only the values file and not touching any other element in the Helm chart.