Define the site's yellow variable.

Signed-off-by: Joe Whitsitt <joe-whitsitt@uiowa.edu>
Remove old font-awesome implementation.

Signed-off-by: Joe Whitsitt <joe-whitsitt@uiowa.edu>
Add new font-awesome implementation.

Signed-off-by: Joe Whitsitt <joe-whitsitt@uiowa.edu>
Add more link button alternative (yellow) and replace yellow hex codes with variable.

Signed-off-by: Joe Whitsitt <joe-whitsitt@uiowa.edu>