Add links to Project Firefly

[sarahxxu]

• Add a page linking to Project Firefly; with links to existing docs

  • Figure out where to place this page - consult Colene and Mihai on content & location
  • Add reference and relationship to Project Firefly
  • GitHub Actions that can be used by Runtime users
  • SDKs that can be used by Runtime users

• Add related info to FAQ