fix download block & RSS feeds

elections/blocks.py

elections/migrations/0008_alter_electionshomepage_content.py

shared/blocks/main.py

shared/feeds.py

shared/models/main.py

shared/static/styleguide2/main.css

shared/static/styleguide2/main.js

.../styleguide2/includes/molecules/program/card_program.html

...includes/organisms/header/elections/candidate_header.html