Slide Format: Content With Caption

[burtlo]

Implement a slide class for the Content With Caption Slide

How the user defines the title slide in their presentation

!SLIDE content-with-caption

##  Left Content Title

Left Content

## Right Content Title

Right Content

Implementation

Register the particular renderer in the slide_post_renderers.rb

SlidePostRenderers.register Renderers::ContentWithCaptionRenderer.new(css_class: 'content-with-caption', content_elements: "h2")

Implement a solution that is similar to columns_renderer.rb.

[burtlo]

We could turn assume all remaining h2 tags will be on the right.