C2LC-287: Implement the new visual designs

Description

Notes:

  • Implement the default theme (mixed) for this task only
    • The other colour themes will be implemented in C2LC-289
  • Apply new interface icons
  • Apply the new colours for the mixed colour theme

Comments

  • Simon Bates commented 2021-02-03T10:08:29.919-0500

    Design tasks outstanding:

    • Position and styling for the Stop button
    • New icons for the speed control
    • Updated styles for disabled, focus, and hover (the “design System” page on Figma)