Move styles to smart answers and scope them within smart_answers class

• added smart_answers.scss for smart answers scoped styles
• move styles from application to smart_answers.scss
• add colours and shims to application from FE toolkit

https://www.agileplannerapp.com/boards/105200/cards/6024
Use Smartdown answer #humanize methods for previous answer display
Merge pull request #1218 from alphagov/humanized-answers

Use Smartdown answer #humanize methods for previous answer display
Merge pull request #1216 from alphagov/scope-styles-to-smartanswers

Move styles to smart answers and scope them within smart_answers class
Disable drafts by default in RAILS_ENV=production

To reduce the chance of a misconfiguration revealing draft content in
production, this changes the default config to not show drafts unless
explicitly overridden.

This removes the `show_transitions: false` option because that's already
the default value for it.
Merge pull request #1221 from alphagov/tweak_flow_preview_config

Disable drafts by default in RAILS_ENV=production
New scenario syntax
Merge pull request #1222 from alphagov/fix-scenario-syntax

New scenario syntax