Create automated GIF of Reflex (Playwright script)

[nwittwer]

Idea: Create a GIF of the main parts of Reflex using a test automation script (e.g. Playwright)

1. Open the app
2. Create screens from a common template
3. Go to a specific website
4. Show how the screens are synchronized
5. Interact with the site
6. ... etc.

There was a previous PR of some ideas for steps here: https://github.com/reflex-app/reflex/commit/8dad5c2b7f61bc3bad85be59bb9933348f128b79#diff-21d5d7707d7bd3c940c02a0b8575826b998745a43b63b0a4e7266ea6847bbed6