Rework corpora package

app/corpora/__init__.py

app/corpora/files/__init__.py

app/corpora/files/forms.py

app/corpora/files/json_routes.py

app/corpora/files/routes.py

app/corpora/followers/__init__.py

app/corpora/followers/json_routes.py

app/corpora/forms.py

app/corpora/json_routes.py

app/corpora/routes.py

app/static/js/Requests/corpora/corpora.js

app/static/js/ResourceLists/CorpusFileList.js

app/static/js/ResourceLists/CorpusList.js

app/static/js/Utils.js

app/templates/_roadmap.html.j2

app/templates/base.html.j2

...peline_models/create_tesseract_ocr_pipeline_model.html.j2

app/templates/corpora/_breadcrumbs.html.j2

app/templates/corpora/corpus.html.j2

app/templates/corpora/corpus.js.j2