Spike for CK Styling Post IE11

[myvuuu]

Open Questions

• What will CSS styling look like after IE11 retires?
• Do we still want to use Emotion? What's a good alternate/replacement?

Emotion was the best solution for CSS styling for IE11 support, but we need to re-evaluate the need for Emotion with the upcoming IE11 deprecation.

Success Criteria

• Provide pros & cons of moving away from Emotion
• Provide a recommendation for Emotion alternative(s)
• Discuss findings and recommendations with team

[myvuuu]

Will not impact #1505