Add styled-components and polished

packages/website/ts/components/ui/island.tsx

@@ -1,6 +1,6 @@
 import * as React from 'react';
+import { colors } from 'ts/style/colors';
 import { Styleable } from 'ts/types';
-import { colors } from 'ts/utils/colors';
 
 export interface IslandProps {
     style?: React.CSSProperties;

packages/website/ts/components/ui/overlay.tsx

@@ -2,7 +2,7 @@ import { colors } from '@0xproject/react-shared';
 import * as _ from 'lodash';
 import * as React from 'react';
 
-import { zIndex } from 'ts/utils/style';
+import { zIndex } from 'ts/style/z_index';
 
 export interface OverlayProps {
     children?: React.ReactNode;