Add endpoint to Facia tool to generate thumbnails for containers
Tweak styling of SVGs
Make container thumbnail appear in config tool
Position thumbnail in top right in config tool
Add thumbs for dynamic/fast and dynamic/slow
Update tool JS to allow dynamic thumbs
add to facia-end-to-end
adjust display a bit
Merge pull request #6599 from guardian/container-thumbnails

Automatically generate SVG thumbnails for container layouts in Facia tool