Setup Playwright and Github Actions to run in CI for end to end tests

[toreylittlefield]

We'll use Playwright for end-to-end testing and additionally UI testing. We must set up Playwright and Github Actions as our CI pipeline. We currently have no backend APIs to test against so we can start with a simple init test example.
See https://playwright.dev/docs/ci-intro

• simple config for Playwright
• config GHA to run Playwright in CI
• simple initial test