default theming and styles for baseline presentation slides

[thescientist13]

Type of Change

• New Feature Request
• Improvement / Suggestion
• Bug
• Other (please clarify below)

Summary

The default theme and styling is going to need a little work. For context, here is what it looks like now in trying to match the Book Report template from Google Slides.
https://awesome-bhaskara-b7d76c.netlify.app/

Details

Currently, Greenwood is being used to power this project with the long term vision being that all the content (markdown files) should be decoupled from the templates / styles. In other words, the CSS can assume a certain structure (combination of h1 - h6, images, lists, etc). So as long as markdown files follow a given format for content, templates can easily support any kind of layout via CSS.

Some high level requirements:

1. Lock in a formal aspect ratio / scaling that can be documented and depended on, possibly with CSS custom properties (related to establish proper aspect ratio for slide rendering and content scaling #7 )

The below are some of the templates that would be ideally needed to support a default theme.

1. Recreating the title screen, with the green corners and blue underscore
   
2. An "agenda" like slide for list slides
   
3. Two Column Slide
   
4. One Column Slide
   
5. Full Text Slide
   
6. Text w/ Image Slide
   
7. Infographic (Stretch / Nice to Have)