use semantic grid in dropdown-login #79
set grid with 48 columns. Closes #48
add media-queries marker in footer #72
use semantic-grid in footer #79
use semantic-grid in home #79
change sponsor-partner img
refactor navbar and use 12 column grid #81
refactor footer and use 12 column grid #81
add classes in logo-cdp svg
refactor dropdown-login and use 12 column grid #81
adjust navbar height
use 12 column grid. Closes #81 #80