Fix CI, Update SearchListItems and add images to BasicBlock
Fixes the CI Build to use node 10.
SearchListItem no longer uses a TopicWrapper and instead just has a div with class around the TopicIcon.
In SearchListContent, SearchListItems are now wrapped in <li>
tags to fix and accessibility and markup issue.
BasicBlocks can now have an image in their h2
instead of just being title and teaser content.