Components with dark background for all components

[julien-deramond]

This issue will provide a dark variant for all components in Boosted.

List of components

• Components
  • Accordion
  • Alerts
  • Back to top (See Back to top: dark variant + small doc fix #1428) Not needed.
  • Badge (Not in DSM and easy to change with .bg-* utilities)
  • Breadcrumb (See Breadcrumb: Add dark variant #1430)
    • Boosted
    • ODS
    • Zeplin
  • Buttons - standard
    • Boosted
    • ODS a bit weird I guess but here
    • Zeplin
  • Button - group (not in DSM)
  • Cards (Fait avec des utilities autre que bg-dark dans Boosted)
  • Carousel (navigation)
    • Boosted (Almost implemented but ff7900 instead of f16e00 on white)
    • ODS (actually werid pagination dots)
    • Zeplin
  • Close button (See Close button: adding missing variants without new class #1489)
    • Boosted Not fully implemented (missing with border example)
    • ODS Not explicit
    • Zeplin
  • Collapse (no spec)
  • Dropdowns (not the multiple one not sure for normal dropdowns implementation colors, but at least it's consistent in Fixes for dropdown #1164)
  • List group (See List group: Branded #1467)
  • Modals no specs, but easy to implement in Boosted)
  • Navs and tabs - tabs (Waiting for Navs: Adding CSS var #1427)
    • Boosted
    • ODS
    • Zeplin
  • Navbars (no specs or Orange navbar and already fine)
  • Offcanvas (no specs)
  • Orange footer
  • Orange navbar
  • Pagination (See Pagination: Adding dark variant #1433)
    • Boosted
    • ODS
    • Zeplin
  • Placeholders (no specs and no need imo)
  • Popovers (no need ?) not needed
  • Progress/Spinners - progress indicators
  • Scrollspy (no specs + dark variant made by other components)
  • Stepped process (See Stepped process: Adding dark variant #1434)
    • Boosted
    • ODS
    • Zeplin
  • Stickers (no specs and easy to change for us if needed)
  • Toasts (no specs)
  • Tooltips not needed
• Content
  • Tables (comes fully implemented with Adding features to tables #859)

Tasks

• List all the components in Boosted that need a dark variant #1140
• Add dark variant of all existing components #1234