Clean, Refactor/Fix and Document updated text-reuse approach

[piconti]

The text reuse has been updated and finalized, but there was not time to fully document the process.

There are several scripts that need refactoring, documentation and some adaptations to new naming conventions discussed afterwards.
This refacotring, cleaning and documentation will be done when applying the text-reuse detection on the next iteration of the corpus for the upcoming release.

This issue focuses on that, with the following action points:

• Fix/adapt the parts of the scripts relating to how and where the data is written in S3.
• Refactor the code when possible, making the code more modular
• Comment the code
• Document the overall approach and how to run everything from start to end.