Created new Foundation project to replace deleted static/css folder. Recreating styling.
Move css_2 into static directory. Delete css directory, which was simply a new Foundation project installed into a folder of the same name as the previous styles folder.
Add Foundation icons collection to css_2 directory.
Rename css_2 to css, to restore relative paths
Add styles by uncommenting in _settings partial. Add custom colors to palette. Add custom CSS rules to app.scss

 - Colors added: purple, steelblue, sandybrown
 - Import Montserrat font
 - Style #detail, #instructions, .hidden
 - WIP: d3 styles for text and bubbles
Finish D3 hover styles.

 - Text color on hover
 - Circle color on hover
Remove gray stroke styling from data_viz javascript file. Bubbles now have no stroke outline.