Added new components and added POC

Pages

• Added POC page

Components

• Added footer subscription
• Added input with button
• Added header with its subcomponents and added some refinements
• Added formfield
• Added basket
• Added hamburger
• Added logo
• Added slogan
• Added toggles
• Split up card
• Added downloadable
• Added basic flyout
• Added basic collapse
• Added notification
• Added subnav
• Added nav
• Added notifications