Update the Color Scheme

As a user, I need the colors of the app to be more readable so that I can easily use the UI in the car.

Acceptance Criteria:

• GIVEN the primary and accent colors in the app
  • WHEN updating the color scheme
    • THEN colorPrimary is #6C63FF
    • AND colorPrimaryDark is #2838CB
    • AND colorAccent is #A491FF

Developer Notes: The color scheme is based on the material recommendations set forth in the Material Color Tool: https://material.io/tools/color/#!/?view.left=0&view.right=0&primary.color=6C63FF