[scripts.upload] Make uploaded data a bit more obvious; Report size of uploaded material; Report URL of uploaded model/experiment; Move gitlab functions to dedicated module; Document dedicated module; Fix QA

[doc] Update installation instructions; Move CUDA-install manifest to separate directory; Test pip installability with uv

Update the installation and usage documentation to reflect changes made
in recent merges. Instructions relating to removed functionality has
been removed. Instructions relating to RS datasets has been commented
out for now as it needs more work.

Lightning API was fixed so these can be removed.