Huge changes to home page and addition of FROSH page

1 - fixed the sub header on homepage
2 - got rid of submenu
3 - changed the size and spacing of the main menu, added 2 new elements
4 - changed the size of the boxes for filterable portfolio
5 - fixed the footer, though it does need work still
6 - created frosh html and css, added all frosh content
7 - validated frosh html and css