Refactoring: rename covid19 to flask_covid19

.gitignore

src/covid19/__init__.py

src/flask_covid19/Gruntfile.js

src/flask_covid19/__init__.py

src/flask_covid19/blueprints/__init__.py

src/flask_covid19/blueprints/app_admin/__init__.py

src/flask_covid19/blueprints/app_admin/app_admin_service.py

src/flask_covid19/blueprints/app_admin/app_admin_views.py

src/flask_covid19/blueprints/app_admin/templates/__init__.py

.../blueprints/app_admin/templates/app_admin/admin_info.html

...blueprints/app_admin/templates/app_admin/admin_tasks.html

...vid19/blueprints/app_admin/templates/app_admin/index.html

...lates/app_admin/navigation/app_admin_navbar_dropdown.html

...min/templates/app_admin/navigation/app_admin_navtabs.html

src/flask_covid19/blueprints/app_all/__init__.py

src/flask_covid19/blueprints/app_all/all_model.py

src/flask_covid19/blueprints/app_all/all_service.py

src/flask_covid19/blueprints/app_all/all_service_config.py

src/flask_covid19/blueprints/app_all/all_service_download.py

src/flask_covid19/blueprints/app_all/all_services.py