[Tracking] IA redesign

[femmebot]

Moved to https://github.com/github/classroom/issues/32

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IA redesign updates based on these priorities. Refer to this IA redesign Figma file for UI details/context.

• [x] New header / navigation: Shipped
  • [x] Issue: https://github.com/education/classroom/issues/2353
  • [x] PR: https://github.com/github/classroom/pull/49
• [x] Update Settings content layout: Shipped
  • [x] Issue: https://github.com/education/classroom/issues/2496
  • [x] PR: https://github.com/github/classroom/pull/58
• [x] Update Admins/TAs content layout: Shipped
  • [x] Issue: https://github.com/education/classroom/issues/2495
  • [x] PR: https://github.com/github/classroom/pull/76
• [ ] Update Roster management:
  • [ ] Issue: ~https://github.com/education/classroom/issues/2497~ https://github.com/github/classroom/issues/35
  • [ ] See earlier work: Move RosterEntry update to background job https://github.com/education/classroom/pull/2233
  • [ ] PR:
  • Description:
    • Improved ability to search/sort roster entries for large classes
    • Updating roster management via modal
    • Layout/UI updates
• [ ] Update Assignment creation and Assignment view pages
  • [ ] Issue: ~https://github.com/education/classroom/issues/2506~ https://github.com/github/classroom/issues/89
  • [ ] PR:
• [ ] Student page view (new page with new functionality)
  • [ ] Issue:
  • [ ] PR: