use govuk frontend v5

[patrickpatrickpatrick]

Trello

• use terser
• bump govuk_publishing_components
• move to sep file
• Remove deprecated SCSS variables

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Search page examples to sanity check:

• https://[HEROKU-APP-ID].herokuapp.com/search/all
• https://[HEROKU-APP-ID].herokuapp.com/search/research-and-statistics
• https://[HEROKU-APP-ID].herokuapp.com/search/news-and-communications?parent=%2Feducation&topic=c58fdadd-7743-46d6-9629-90bb3ccc4ef0
• https://[HEROKU-APP-ID].herokuapp.com/drug-device-alerts
• https://[HEROKU-APP-ID].herokuapp.com/find-eu-exit-guidance-business
• https://[HEROKU-APP-ID].herokuapp.com/find-eu-exit-guidance-business?keywords=eori&order=relevance
• https://[HEROKU-APP-ID].herokuapp.com/find-eu-exit-guidance-business?sector_business_area%5B%5D=aerospace&order=topic
• https://[HEROKU-APP-ID].herokuapp.com/uk-nationals-living-eu

Other finders