Curriculum and sticky sign up form

Homepage now includes a course curriculum, well part of one at least. More to come soon. Lot’s of other smaller bits too.

New features

• Currculum added to homepage
• Scroll margin added to id’s for elements that can be targeted, a nice little trick I leart from Andy Bell
• Menu added to sitehead

Changes

• Site logo in sitehead moved to left and site title hidden for all but screen readers
• Sign up form now sticky on larger devices and includes first name input, also removed button down link

Bug fixes & improvements

• Callout now takes an optional icon, also added missing box shadow
• Replaced missing paragraph spacing on generic single pages, like thanks, etc