bug: References to Cheyenne instead of Derecho in DART

[ann-norcio]

Describe the bug

There are multiple references to Cheyenne in DART documentation, code comments, and scripts. This can potentially lead to confusion for new users.

Suggest to start with reference changes to Cheyenne -> Derecho on non-executables like documentation & comments, then move on to scripts/areas where the use of Cheyenne is hard coded. Test that the changes are valid/applicable on Derecho.

1. List the steps someone needs to take to reproduce the bug.

   anorcio@derecho6 $ find DART -type f -exec grep -liE "cheyenne|Cheyenne" {} \+ | awk -F. '{if (NF>1) print $NF; else print "no filetype"}' | sort | uniq -c | sort -nr
    18 csh
    16 no filetype
     7 template
     7 sh
     4 rst
     4 py
     3 md
     2 nml
     2 25
     1 yaml
     1 regional
     1 launch
     1 iono_example_files
     1 git/index
     1 f90
     1 csv

Version of DART

Which version of DART are you using? v11.0.3

Have you modified the DART code?

No

Build information

Please describe:

1. Derecho
2. intel

[hkershaw-brown]

linked issue https://github.com/NCAR/DART/issues/642