fix image alignment

...ations/0251_alter_districtarticlepage_content_and_more.py

...ons/migrations/0046_alter_electionsarticlepage_content.py

main/migrations/0105_alter_mainarticlepage_content.py

shared/blocks/__init__.py

shared/blocks/children/mixins.py

shared/const.py

shared/static/styleguide2/main.css

shared/static/styleguide2/pirati-ui.svg

...grations/0096_alter_uniwebarticlepage_content_and_more.py

...rations/0097_alter_uniwebflexiblepage_content_and_more.py

uniweb/models.py