BLAS environment handling documentation

[JakeSAI]

OPENBLAS (used explicitly in projection and under the hood in louvain clustering) appears to fail when OPENBLAS_NUM_THREADS is not set in the environment.

We should help users get their environment set up correctly by adding notes to guide them in the right direction.

Tasks:

• Attempt to repro error: Create clean conda environment, and run through projection, PCA, clustering; try tasic data first
• Isolate error by running in an environment that does cause the error
• Create an install readme and add notes about setting up a clean conda environment correctly

Validation:

• Projection, PCA, and clustering succeed in README standard conda environment where they were failing in Jake's pipenv environment
• Record the exception here that is encountered by running in the pipenv environment