There are outdated screenshots in README.md

- [x] I have searched the [issues](https://github.com/ActivityWatch/activitywatch/issues) of this repo and believe that this is not a duplicate.
- [x] I have searched the [documentation](https://docs.activitywatch.net/en/latest/) and believe that my question is not covered.

## Issue
The [README.md file](https://github.com/ActivityWatch/activitywatch/blob/master/README.md#screenshots) contains outdated screenshots because you updated the design in version [0.11.0](https://github.com/ActivityWatch/activitywatch/releases/tag/v0.11.0). It's worth updating them.