#1.) The buttons have been removed from the homepage; however, the pages that those buttons linked to are all still available on the menu on the left side of the screen. #2.) Each sub-page associated with each course now has a unified set of menus that run along the top of the page. (See below for more details.)
You are encouraged to use the search bar in the upper right-hand corner of each page on the site if you are having difficulty locating something. You may also contact the Webmaster at firstname.lastname@example.org if you have any questions.