WIP - migrate & merge blocks

...ations/0232_alter_districtarticlepage_content_and_more.py

...ons/migrations/0040_alter_electionsarticlepage_content.py

main/migrations/0097_alter_mainarticlepage_content.py

shared/blocks/base.py

shared/const.py

shared/static/styleguide2/main.css

shared/static/styleguide2/pirati-ui.svg

...leguide2/includes/atoms/text/prose_advanced_richtext.html

...lates/styleguide2/includes/atoms/text/prose_richtext.html

...grations/0068_alter_uniwebarticlepage_content_and_more.py

uniweb/models.py