cleanup: Remove expired ports:

2021-09-15 www/py-django-rest-swagger: Has expired: Upstream no longer maintained, please use www/py-drf-yasg instead
2021-09-15 www/py-django-taggit-serializer: Obsolete, please use www/py-django-taggit instead
2021-09-16 www/efront: Unsupported by upstream