- close btn contrast ratio
- adding aria-label to carousel

- carousel updates
- mobile header image id update

- 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