potentially redundant files in src directory: smlp_text.py and transformer.py

[zurabksmlp]

Make sure these files are not used any more -- are not imported in the rest of the code:
files in repo/src directory: smlp_text.py and transformer.py.
File smlp_text.py implemented text processing stuff but likely this functionality is now in smlp_nlp.py
File transformer.py contained a custom implementation of the transformers library of HG (?). It was useful to learn how transformers work,
See also PR #21