Document updated text-reuse detection process

[piconti]

Once the text-reuse clusters have been identified on the new corpus, using both passim v1 (spark scala based) and v2 (python based), the best process should be chosen, and corresponding processing steps should be documented in detail for furture reference.

Action items:

• Document steps for scala version 1
• Document steps for python version 2
• Express the difference between the two (where exactly to define)

[piconti]

This is only relevant if we switch versions to use python instead.
Putting this on hold as a more recent issue on documenting the current approach has been created