[Functionality] document-style page context(s) need to exist generalized or specific to certain-use cases

## Problem
Hyper dense informational pages that are more or less a "digital document" need the ability to display and organize their content and structure.

## Description
The license pages within the Index Project (creativecommons.org) are good specific examples of this. A more generalized context here would allow direct use or modified use from this foundational context. Digital guides and documents related to other sites like certificates or even the resource archive may benefit from the same.

Work here would need to factor in adjustments to the header region of the context, and how the layout can shift seamlessly to a single or two column layout without or with a sidebar menu appropriately.

## Additional context
likely related:
* https://github.com/creativecommons/index-prototype/issues/64
* https://github.com/creativecommons/vocabulary/issues/25
## Implementation

- [x] I would be interested in implementing this feature.