www/py-hyperkitty: [NEW PORT] A web interface to access GNU Mailman v3 archives

Hyperkitty is a web interface to access GNU Mailman v3 archives.

Three other ports are added as dependencies of py-hyperkitty:

• www/py-django-q2
• www/py-robot-detection
• www/py-mailman-hyperkitty

PR: 281463 281464 281465
Approved by: yuri@ (Mentor)

Differential Revision: https://reviews.freebsd.org/D52550