Automate release posts custom styling

Sean: @marcia see my recent commit for the foundation to work from. The dynamic parts are all done, we just need to add the existing HTML structure around them. => done!

Review apps: https://automate-release-post.about.gitlab.com/2017/05/22/gitlab-9-2-released/

Tasks:

• Add loop through badges
• Fix loop through primary and secondary features (they are repeating themselves)
• Code review
• Add fancy link to headings (anchor link)

Added:

• .shadow to all images, + create conditional if you don't want shadow with image_noshadow = true entry in the Yaml file
• conditional for deprecations
• documentation_text with fallback to Read through the documentation on #{top_feature.name}
• conditional image_url to all secondary features
• conditional for CTA buttons

Further actions:

• Merge into release-9-2
• Update handbook

cc/ @axil @SeanPackham @dimitrieh @jschatz1 @timzallmann