feat: booster homepage redesign

[dave52]

• update Booster homepage with new design, based roughly on these mocks: https://xd.adobe.com/view/75663194-636a-4008-999d-287b78a935cf-2035/specs/
• add site global footer
  • a later enhancement would be footer links map to pages as the side nav behaves (i.e. point to first child page of a category, versus the hard linking that is currently happening)
  • a footer 'light' color theme for pages with a sidenav would look much better and less heavy, at a later date too
• improve responsiveness at least to a 900px width-ish size
  • more mobile -> desktop responsiveness is needed especially for mobile
• add some a11y
• 'Branding' rename -> -'Branding marketing guide', remove as top level nav item, only accessible from footer now

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