Remove unnecessary margin-top
Merge pull request #526 from moneyadviceservice/bug_in_safari_auth

Remove unnecessary margin-top
Add Feedback entity.
Setup ActionMailer.
Add a basic feedback repository with a private mailer.
Add a FeedbackWriter interactor.
Add dough.
Refactor feedback entities to cover different types of feedback.
Implement feedback page for articles.
Implement general (technical) feedback page.
Implement the money advice page.
Add links to give feedback to the article show page.
Put the feedback panel on articles behind a feature toggle.