74 dropdown redesign

[meissadia]

Updates to components to support the scenarios needed for the Complete User Profile page.

Closes #74

Changes

• Dropdown
  • Updates styling of pills
  • Allows customization of pill display location and hiding them
  • Allows display of checkbox next to dropdown options
  • Allow a 'Clear All' button to quickly clear selections
• Icon
  • Display with or without background
  • Support propagation of all supported HTML props
• Label
  • Hide if no label text provided
• Notification
  • Enable show/hide via props
  • Enable show/hide icon via props
• [New] Divider component to provide a horizontal rule
• Page Header
  • Remove unnecessary margin
• Well
  • Code cleanup

How to test this PR

1. Open the Netlify preview
2. Visit the Dropdown, Icon, Label stories
3. See if things look sensible

Notes

• I hate typescript

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