Copy index.html to build folder on make and add more boxes

Copy index.html to build folder on make build and serve this copy when
testing. Update references to build files in the index to reflect this
move. Add more boxes.
Update styles to match newest design sketches

Rename box classes (interactive-box -> primary-box, etc). Change some
margins, sizes and floats/clears. Remove some obsolete html elements
and classes/styles. Improve chart placeholder.
Remove trailing whitespace and unused variable
Replace fa-stacks with encircled icons
Merge pull request #4 from bdo-labs/style-updates

Update styles to match newest design sketches