Big screen link - add subheading / change link text as per updated design
Merge pull request #873 from alphagov/big-screen-link

Big screen link - add subheading / change link text as per updated design
Introduce the section module type server-side
Introduce the section module type client-side
Increase specificity of styles
Style section heading
Suppress linkable heading tag for sections
Remove unnecessary code
Stub out Stagecraft for a sectioned dashboard
Linting
Add schema for section module type