elections2021: Homepage done and templates updates

elections2021/migrations/0022_auto_20210517_1539.py

...ations/0023_alter_elections2021homepage_elections_date.py

...21/migrations/0024_elections2021programpage_head_title.py

elections2021/models.py

elections2021/static/elections2021/css/styles.css

elections2021/templates/elections2021/_article_card.html

elections2021/templates/elections2021/_page_header.html

elections2021/templates/elections2021/_side_panel.html

elections2021/templates/elections2021/base.html

...1/templates/elections2021/elections2021_article_page.html

.../templates/elections2021/elections2021_articles_page.html

...tes/elections2021/elections2021_candidates_list_page.html

...2021/templates/elections2021/elections2021_home_page.html

...1/templates/elections2021/elections2021_program_page.html

...templates/elections2021/elections2021_questions_page.html

...ates/elections2021/elections2021_strategic_list_page.html