Remove NVidia Docker dependencies

[arjo129]

We should remove nvidia-docker dependency (in our documentation as well) as it is not necessary for our use case - we don't use CUDA at all. To the best of my knowledge it should be possible to run gazebo with opengl without nvidia-docker.

[hidmic]

@arjo129 we are not bringing CUDA with the container either, but the officially supported image that is known to work with nvidia-docker. Not using nvidia-docker at all would be a larger leap. How well does Gazebo do with Radeon and Intel graphics nowadays?

[arjo129]

I dont see any issues for our purpose on my laptops with integrated radeon and intel graphics. We are not really pushing the graphics card for lrauv-sim.