Remove geophysical-data doc page

[aaronspring]

Deletes docs/source/geophysical-data.ipynb (rendered as geophysical-data.html) and removes its entry from the index.rst toctree so the docs build stays clean.

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.57%. Comparing base (e457985) to head (106cc18).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #453   +/-   ##
=======================================
  Coverage   94.57%   94.57%           
=======================================
  Files          27       27           
  Lines        2841     2841           
=======================================
  Hits         2687     2687           
  Misses        154      154           

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