Centered gaussian release

[smaticka]

This PR reflects the changes being done in roms related to this isssue: CWorthy-ocean/ucla-roms#31

Previously, the gaussian shape was previously multiplied by the height of each cell, but since the cell heights varied, the larger cells reflected more mass.

By removing the cell height product, the distribution looks more centered around the release location:

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.73%. Comparing base (a18c2f0) to head (eb77d2e).
⚠️ Report is 17 commits behind head on main.

@@            Coverage Diff             @@
##             main     #413      +/-   ##
==========================================
- Coverage   92.73%   92.73%   -0.01%     
==========================================
  Files          23       23              
  Lines        5481     5479       -2     
==========================================
- Hits         5083     5081       -2     
  Misses        398      398              

Flag	Coverage Δ
unittests	92.73% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
roms_tools/setup/cdr_forcing.py	90.93% <100.00%> (-0.06%)	⬇️

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[smaticka]

Thanks for adding the details to release.md @NoraLoose. I forgot about that pre-commit step. Do you think it's appropriate to add the things to do when contributing? here: https://github.com/CWorthy-ocean/roms-tools?tab=contributing-ov-file

I think this PR is otherwise ready to go.