add logo, customized title text and favoritcon (for the browser tab)
Merge pull request #31 from jackfengibm/add_logo_N_link

add logo, customized title text and favoritcon (for the browser tab)
added logo and footer;also convert menu to buttons
Merge pull request #32 from jackfengibm/add_logo_N_link

added logo and footer;also converted menu links to buttons