Modal component

Refactor to use the React portals (done).

Some functionality that could be added which would be helpful.
- option to close modal when clicked outside modal

Look at other examples of modals that are used. Get list of features that would be helpful to add to modals.

There are a couple ways to make this better - we should weigh pros/cons and decide if we want to implement for 1.0.

Acceptance criteria:
- Should have option to close modal when clicked outside of modal
- Should be WIA-ARIA accessible

E: 2D