Remove expired ports:

2020-06-01 www/py-djangotoolbox: No longer maintained, not compatible with Django 1.11+
2020-06-01 www/py-dojango: No longer maintained, not compatible with Django 2.2+
2020-06-01 www/py-django-json-rpc: No longer maintained, not compatible with Django 2.0+
2020-06-03 www/mediawiki132: EOLed upstream