- updating header element to contain main menu and breadcrumbs
- updating footer element to contain subfoot div
- updating osu navbar h2 tag to make not visible to screen readers

- adding focus outlines to images in footer, news, events, research, and newsletter
- making skip link visible on focus
- adding underlines to link tags to make contrast ratio appropriate
- removing unallowed aria tag from accordion

- removing extra nav element from main menu
- fixing width on submenus during mobile transition for zoomed in readers

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