DX: Implement DX for third contact

[BioPhoton]

Todos

CLI

• 💻 setup scalable testing architecture
  • add a test
  • add a page
  • add a UI element
  • add fixtures
  • add budget

User Flows:

• json UFOs to have actions as only format

LH Configuration:

• Add more docs for LH configuration #161

GH Integration:

• ⚙ run it against the main branch to check
• 💻 get a warning / error when a PR causes performance regression that below the budget
• 💻⚙docs for authentication docs: authenticated pages #20