Replacing django-rest-swagger package that is deprecated with new drf-yasg package

This merge request will omit the use of django-rest-swagger which is deprecated and replaces it with drf-yasg package.

The new package provides a more detailed api web page and also automatically produces json/yaml files that can be rendered directly in sphinx documentation.

This MR also sets up the necessary steps to replace the old documentation for web api with new automatically generated ones, but is not fully in effect yet.