Fix failure for link to underline on promo boxes
Allow heading tag helper to accept optional attrs
Allow heading tag helper to accept optional block
Apply accessible headings to views
Add accessible headings to the content
ActionPlanDecorator is a ContentItemDecorator

Allows ActionPlanDecorator to inherit the default html_processors that are common for all the content decorators
ActionPlanDecorator keeps the right aria-level value
NewsArticleDecorator uses the inherit html processors
Merge pull request #597 from moneyadviceservice/headings

Accessible Headings
Add footer components to the styleguide website components page
Merge pull request #602 from moneyadviceservice/footer_components

Add footer components to the styleguide website components page
Create page object for chat and add test classes to HTML
Add test class for welsh warning