The "How to develop" README instructions for Conda don't work on an Apple M1

[drauschenbach]

Describe the bug
The development instructions, as written, are unnecessarily specific to Linux.

To Reproduce
On an Apple M1:

$ micromamba env create -f ./conda/environments/datafusion-dev.yaml -n datafusion-dev

conda-forge/osx-arm64                                         No change
conda-forge/noarch                                  17.1MB @  10.5MB/s  1.6s
error    libmamba Could not solve for environment specs
    The following packages are incompatible
    ├─ cudatoolkit 11.8**  does not exist (perhaps a typo or a missing channel);
    └─ cudf does not exist (perhaps a typo or a missing channel).

Expected behavior
The instructions should work on operating systems that don't support CUDA Toolkit or cuDF.

Additional context
(none)