fix AttributeError: 'list' object has no attribute 'split'

fix TypeError: 'in <string>' requires string as left operand, not list

fix TypeError: 'Document' object is not iterable, caused by line 76 which now became line 80-81 because we not only fix that error but also added more code before that line to preprocess text better

switch from spacy to stanza for compatibility

fix spacy and en_core_web_sm errors

fix spacy and en_core_web_sm errors

releasing the app to the public