www/py-bootstrap-flask: New port

Bootstrap 4 and 5 helper for Flask projects

Bootstrap-Flask is a collection of Jinja macros for Bootstrap 4 & 5 and Flask.
It helps you to render Flask-related data and objects to Bootstrap markup HTML
more easily:
  - Render Flask-WTF/WTForms form object to Bootstrap Form.
  - Render data objects (dict or class objects) to Bootstrap Table.
  - Render Flask-SQLAlchemy Pagination object to Bootstrap Pagination.
  - etc.

https://github.com/helloflask/bootstrap-flask