Add new form markup examples
Update .form__ component class names as per team discussion
Add form__group-input styling
Merge pull request #426 from moneyadviceservice/styleguide-form-examples

Add new form markup examples
Merge branch 'master' of github.com:moneyadviceservice/frontend
Don't display duplicates when related contents appear in multiple categories
fixup! Don't display duplicates when related contents appear in multiple categories