EL-1431: Search page - Update styling

[MazOneTwoOne]

What does this pull request do?

• Updating FALA landing / search page with new design changes

Any other changes that would benefit highlighting?

• Not able to create a 3 grid column for checkboxes, using existing GDS layouts and styling;
  • We could do this but would end up having to make our own CCS classes, which is not ideal.
• The checkboxes backgrounds are not white and instead transparent, as per their design;
  • There is an open issue discussing this Why do checkboxes and radios have transparent backgrounds? · Issue #1625 · alphagov/govuk-frontend
  • There is a workaround which I have borrowed.

Checklist

• Provided JIRA ticket number in the title, e.g. "LGA-152: Sample title"

[sonarqubecloud]

Quality Gate failed

Failed conditions
9.5% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[exonian]

I can't deny my eyes glazed over slightly for the html, but nothing jumped out, and the Python looks good

[psweeting1]

LGTM