Use pypi package as source for conda build
Opening this issue so we don't forget about it.
hslvdpropy is available on pypi: https://pypi.org/project/hlsvdpropy/
Unfortunately it hasn't been updated since 2020. But if it does start getting maintained, it would be nice to build our conda packages from pypi, rather than from https://github.com/bsoher/hlsvdpropy