Added a paper to the research showcase page

[MilesCranmerBot]

Fresh replacement for #1171 using the image hosted from PySR_Docs PR #6.

This avoids the fork-permission/image-upload issue from the original PR by referencing the hosted image directly.

Supersedes #1171.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.25%. Comparing base (066e1d3) to head (a2ca699).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1172   +/-   ##
=======================================
  Coverage   94.25%   94.25%           
=======================================
  Files          21       21           
  Lines        1687     1687           
=======================================
  Hits         1590     1590           
  Misses         97       97           

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