Third pass at reordered home page

Changed order and contents of mega menu. Added a My Accounts button to
the top-right corner of screen — positioned it slightly to the left to
side-step corner badge. Removed My Accounts column from footer and
expanded Today’s Library Hours to fill 50% of the width. Added zebra
stripes to Library Hours table. Refactored libraryinfo.js to be more
general and used in more than just the About The Libraries mega menu
option.