text: Title: improve and extend the docs & Readme
  Body: ### Description
  
  This should be a good first issue for new comers who want to join the project. Improve the readme and docs if you see any improvement possibility.
  extend igel's docs by providing a full description about the key value pairs that can be set in the yaml file.
  
  example:
  
  - scaling values: user can use normalization or standardization. Both methods should be explained clearly.
  
  Furthermore, it would be nice to have a copy to clipboard button for the terminal commands in the docs. This would be awesome 
  