Curated syllabi: add tabs to Learn page

[techtolentino]

Feature description

To begin building the curated syllabi experience, we'll need to update the Qiskit org Learn page with tab components.

Acceptance criteria

• implement tabs and tab views, using the Carbon vue tab component ( cv-tab )
• the Learn page will now have two tab views: one for Learn, and one for Teach
• add new Teach view
  • Curated syllabi section title
  • curated syllabi section description
  • curated syllabi cards

Additional context

• For design questions or guidance, please reach out to @gracelindsell
• this PR should be merged in coordination w/ the Platypus Curated Syllabi milestone

Note

(Design and acceptance criteria are subject to change, prior to sprint planning)