document installation from source using the published package

[martinResearch]

In the documentation it is said one should use pip install git+https://github.com/nerfstudio-project/nerfacc.git
build the CUDA code during installation.
An alternative that allows on to still use the published package from pypi.org is to use pip install --no-binary=nerfacc nerfacc which will do the installation using nerfacc-0.5.3.tar.gz instead of nerfacc-0.5.3-py3-none-any.whl
it would be great to document this option too.