Recommended package tbb is only for x86

[taldcroft]

Description of the Issue

The installation instructions recommend installing tbb. When I tried this on my Mac Silicon, pip complained that the package does not exist. This caused some confusion until I discovered that this package is provided by Intel for x86 processors.

Suggestions regarding the Issue

Update the docs to mention that tbb is only for x86 processors.

[matteobachetti]

Thanks @taldcroft for reporting the issue!

[matteobachetti]

Removing tbb from dependencies altogether seems to resolve the issue. I think that numba is now taking care of installing it when needed.
We had probably added it at a time when this did not happen automatically.