cleanup: Remove expired ports:

2022-06-30 www/py-dj32-django-filter: Obsolete, please use www/py-django-filter
instead
2022-06-30 www/py-dj32-djangorestframework: Obsolete, please use
www/py-djangorestframework instead
2022-06-30 www/py-dj32-drf-yasg: Obsolete, please use www/py-drf-yasg instead
2022-06-30 www/py-dj32-django-cacheops: Obsolete, please use
www/py-django-cacheops instead
2022-06-30 www/py-dj32-django-graphiql-debug-toolbar: Obsolete, please use
www/py-django-graphiql-debug-toolbar instead
2022-06-30 devel/py-dj32-django-rq: Obsolete, please use devel/py-django-rq
instead
2022-06-30 www/py-dj32-django-tables2: Obsolete, please use
www/py-django-tables2 instead
2022-06-30 www/py-dj32-django-prometheus: Obsolete, please use
www/py-django-prometheus instead
2022-06-30 www/py-dj32-django-treebeard: Obsolete, please use
www/py-django-treebeard instead
2022-06-30 www/py-dj32-django-mptt: Obsolete, please use www/py-django-mptt
instead
2022-06-30 devel/py-dj32-graphene-django: Obsolete, please use
devel/py-graphene-django instead
2022-06-30 www/py-dj32-django-taggit: Obsolete, please use www/py-django-taggit
instead
2022-06-30 www/py-dj32-django-auth-ldap: Obsolete, please use
www/py-django-auth-ldap instead
2022-06-30 www/py-dj32-django-cors-headers: Obsolete, please use
www/py-django-cors-headers instead
2022-06-30 www/py-dj32-django-debug-toolbar: Obsolete, please use
www/py-django-debug-toolbar instead
2022-06-30 www/py-dj32-django-redis: Obsolete, please use www/py-django-redis
instead
2022-06-30 www/py-dj32-django-timezone-field: Obsolete, please use
www/py-django-timezone-field instead
2022-06-30 www/py-dj32-django-js-asset: Obsolete, please use
www/py-django-js-asset instead

*/py-dj32-*: Deprecate/Set to expire

* The port net-mgmt/netbox was switched from Django 3.2 to Django 4.0
  in d96a960530f3c20a9edd7837583ff7bec092566f.

  Since then all the */py-dj32-* ports have no more consumers and all
  the other Django ports have been switched to Django 3.2 in the last
  few weeks. [1] Hence the py-dj32-* ports are redundant now.

  Mark the py-dj32-* as deprecated and set an expiration to the end of
  2022Q2 to get a clean 2022Q3 branch.

PR:		261313 [1]

*/*: Cleanup after the removal of lang/python36

* Remove codes that aren't necessary after the removal of lang/python36
* Mark ports that aren't necessary with Python 3.7 or later as
  DEPRECATED and set EXPIRATION_DATE.

PR:		261046
Approved by:	lwhsu (python)

www/py-dj32-django-treebeard: Add new port

django-treebeard is a library that implements efficient tree
implementations for the Django Web Framework 1.8 and later.

Features:

- Flexible: Includes 3 different tree implementations with the same API:
  * Adjacency List
  * Materialized Path
  * Nested Sets
- Fast: Optimized non-naive tree operations
- Easy: Uses Django Model Inheritance with abstract classes to define
  your own models.
- Clean: Testable and well tested code base. Code/branch test coverage
  is above 96%.

WWW: https://github.com/django-treebeard/django-treebeard

NB: This port is assigned to Django 3.2 and www/py-django-treebeard was
    used as a template.

Reported by:	sunpoet (via mail)