design a basic ui

[smcalilly]

with these pages:

• home
  • for now, where the general map will go (create a general data view #15)
• about
  • stub it out. for now, will be a place to experiment with typography and other text-based styling.
• precincts
  • where the map for map the precincts with census data #12 will go
• api docs

todo:

• implement react router for each page
• create a generic map component and use in each page