Updated Intel configs, removed outdated configs, and added graphviz for docs rendering

[sseraj]

Purpose

I updated the Intel config files so that they work with Intel MPI and HPE MPI (used on NAS). The config files check for the I_MPI_ROOT environment variable to determine if Intel MPI is being used.

In addition, I removed the following outdated config files:

• config.LINUX_INTEL_SAFE.mk because -O2 is generally safe with ifort and we have been testing this for several years now
• config.OSX_GFORTRAN.mk because this is untested, most likely broken, and we have the ARM Docker images now
• The old_architectures folder because these files are 10+ years old and clutter the search results for the repo

Expected time until merged

1 week

Type of change

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [x] Maintenance update
• [ ] Other (please describe)

Testing

I tested on one of our Intel MPI images and on NAS with HPE MPI.

Checklist

• [ ] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [ ] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [x] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #310 (4ded19b) into main (e7ada3d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #310   +/-   ##
=======================================
  Coverage   41.98%   41.98%           
=======================================
  Files          13       13           
  Lines        4001     4001           
=======================================
  Hits         1680     1680           
  Misses       2321     2321           

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