make icon and text hover states occur simultaneously
add hover state to notifications icon
update menu icon and add menu icon to fontello
set nav-collapse overflow to visible/hidden in appropriate media queries
specify correct media query width
adjust margin for menu icon
remove unnecessary media query
remove padding on .intro
add top margin on .items-index
update styles for search input and buttons on index pages
Revert "remove unnecessary media query"

This reverts commit 4290cebd40357fd36181d23bea5ac4818fb56f70.
center notifications & profile links for mobile