Merge pull request #23 from moneyadviceservice/frontend

Latest frontend
Added article types to seeds
Category seeding works with multi sites
Highlight search terms on search result page
Merge pull request #24 from moneyadviceservice/highlight-search

Highlight search terms on search result page
Make whole of alert clickable
Basic error message formatting for form inputs and some tidy ups
Formatting tweaks for listing
Tidy up categories formatting
Constrains alert clickable area to alert__inner area