Create shared links in relevant parts

district/models.py

main/models.py

main/templates/main/includes/article_carousel_item.html

main/templates/main/includes/href_button.html

main/templates/main/includes/person_article_preview.html

main/templates/main/includes/small_article_preview.html

shared/models.py

shared/templates/styleguide/2.3.x/article_card.html

uniweb/models.py

uniweb/templates/uniweb/uniweb_article_page.html