Made changes to buttons, forms and pricing section.

- Centered button in pricing
- Updated pricing divs to reflect new information that was in pitch this morning
- For the user sign up/login screens: wrote descriptions in sign up/login:
-- Sign in to view analytics on your advertising campaign
-- Sign up and once you make a purchase you will be able to view custom analytics on your campaign.
- Switch all buttons to look better, add class: “btn": (did for most buttons, probably not all)
--Contact us sent message, edit profile, products page, checkout pages
- Modified the checkout form and new product form