[ADD] PeopleGroupListBlock to custom page and crossroad page

...migrations/0047_districtcrossroadpage_content_and_more.py

district/models.py

district/templates/district/district_crossroad_page.html

...n/migrations/0022_regioncrossroadpage_content_and_more.py

region/models.py

region/templates/region/region_crossroad_page.html