Restructure Contributions with nested blueprints

app/contributions/__init__.py

app/contributions/forms.py

app/contributions/routes.py

app/contributions/spacy_nlp_pipeline_models/__init__.py

app/contributions/spacy_nlp_pipeline_models/forms.py

app/contributions/spacy_nlp_pipeline_models/json_routes.py

app/contributions/spacy_nlp_pipeline_models/routes.py

app/contributions/tesseract_ocr_pipeline_models/__init__.py

app/contributions/tesseract_ocr_pipeline_models/forms.py

...ontributions/tesseract_ocr_pipeline_models/json_routes.py

app/contributions/tesseract_ocr_pipeline_models/routes.py

app/templates/contributions/contributions.html.j2

...p_pipeline_models/create_spacy_nlp_pipeline_model.html.j2

...pacy_nlp_pipeline_models/spacy_nlp_pipeline_model.html.j2

...acy_nlp_pipeline_models/spacy_nlp_pipeline_models.html.j2

...peline_models/create_tesseract_ocr_pipeline_model.html.j2

..._ocr_pipeline_models/tesseract_ocr_pipeline_model.html.j2

...ocr_pipeline_models/tesseract_ocr_pipeline_models.html.j2