POE - pull page-scope features out of the kanban component

[KMnOFour]

Describe the issue
The POE page contains the Kanban component, which is correct, but Kanban contains structure that belongs to the parent. It needs refactoring to better align with the separation of concerns between pages and components.

The general rules are that page components:

• handle route requests (have a path defined in App.js)
• determine the basic page layout and placement of components
• contain the page Title, SidenavContainer, and Table components

Anything in the components folder must be contained by a parent page inside the parent's Main component, and should be structured so that different pages can share it without accidentally nesting duplicate sidenavs, page titles, or other page structures.