Data and Provider Handling for Keyboarding Between Components. Latest

This release implements the architecture and data necessary for further development.
A parentRef is defined and passed into the NavigationListComponent from lists associated with buttons in the SubNavigation component. A new context provider, NavigationProvider, and an accompanying hook have been added to support the registration of focusable elements and their parents as objects in an array within the NavigationProvider. State is maintained using React's useReducer().

Articles attached to this release include:

• Are You My Parent?: Scaffolding in the architecture necessary for keyboard handling between components.
• Laying it all out on the vertical