Use `rich` to render progress bars and add UI progress for Docker image pull

[Skazza94]

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Currently, Kathará relies on the progressbar2 library to render UI progress bars. The rich package is a much better alternative, since it displays coloured and rich progress bars (it is the same package used by PyPI).

Moreover, Kathará lacks informative progress display during the Docker image pull process. This can lead to confusion while pulling, especially when dealing with large images or slower network connections.

We plan to replace progressbar2 with rich and contextually add support for progress display during Docker image pull