Running the app

Summary

1. Introduce to the Epic Stack app, briefly.

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1. Changes in playwright.config.ts, mainly:
2. PORT at which the app will be running. use.baseURL to we can use relative URLs in our tests.
3. The webServer option to spawn our app and wait at the given PORT.
4. reuseExistingServer allows us to use an already running app locally for faster tests.
5. testDir set to ./tests/e2e since our app now also has other types of tests.

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1. New test at tests/e2e/homepage.test.ts. We need to test our app, not running epicweb.dev.
2. The basic structure of the test remains the same though:
3. Visit the homepage / (since we enabled relative URLs).
4. Assert that the heading text is visible to the user.
5. Verify the test via npm run test:e2e.