Reduce file size of Benchmarks

[andrewwinters5000]

Change control files to use skeleton plot format. Replace sem format plots with skeleton plots.

TODO:

• [x] Lower the order on the 3D meshes for smaller file size.
• [x] Remove redundant plot files from the examples director.
• [x] Add a README to the Examples directory.
• [x] Change the parameters in the examples control files to match the Benchmarks.
• [x] Remove mesh files if storage is still too large.

Resolves #46

[codecov[bot]]

Codecov Report

Merging #68 (401e7b4) into main (d71e363) will increase coverage by 0.16%. The diff coverage is n/a.

:exclamation: Current head 401e7b4 differs from pull request most recent head be2328d. Consider uploading reports for the commit be2328d to get more accurate results

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   73.98%   74.15%   +0.16%     
==========================================
  Files          67       67              
  Lines       10164    10164              
==========================================
+ Hits         7520     7537      +17     
+ Misses       2644     2627      -17     

Flag	Coverage Δ
unittests	74.15% <ø> (+0.16%)	:arrow_up:

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