Integrate global navigation and legacy toggle

Ben Silvermanrequested to merge
blms/legacy-toggle into develop

Note that the base branch is blms/docdash-quick-actions since I've been branching off of that locally.

In this PR

  • API endpoint for currently logged in user
  • Add can_invite and is_staff to user serializer
  • Migration to add the legacy mode toggle field to the User model, and populate existing records with legacy_mode=True
  • Global nav component
    • Replace existing nav with new global nav component
    • Vue export and webpack entrypoint for global nav

Merge request reports