Simplify conda environment & installation about point-label-aware-superpixels

[Tobias-Fischer]

Ah, no one can help anyone on Windows :P

[sgraine]

Unfortunately this doesn't work on windows... you can't download pytorch_cluster from conda-forge for windows so the pytorch_geometric package fails:

Encountered problems while solving.
Problem: nothing provides pytorch_cluster needed by pytorch_geometric-1.6.0-pyh9f0ad1d_0

But it does work fine on windows if you do:
mamba create -n pointlabelspix python pytorch torchvision matplotlib scikit-image scipy torchmetrics -c conda-forge
conda activate pointlabelspix
mamba install pyg -c pyg

[sgraine]

Simplified installation as much as possible while still maintaining compatibility with windows.