Refactor ColPali model documentation (#37309)
* Refactor ColPali model documentation
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* Include quantisation exemple + real images
* simpler image loading
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
