Fixes Mesh README broken links

[peterdsharpe]

• Introduced scripts to render the PyVista stock airplane mesh with Gaussian and mean curvature visualizations, saving outputs as PNG images.
• Updated README to reflect new image paths for the airplane mesh and curvature visualizations.
• Added a plain wireframe rendering of the airplane mesh for basic visualization.

These additions enhance the documentation and provide visual examples for curvature computations in the physicsnemo mesh module.

PhysicsNeMo Pull Request

Description

Closes #1537

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• The CHANGELOG.md is up to date with these changes.
• An issue is linked to this pull request.
• If I am implementing a new model or modifying any existing model, I have followed the Models Implementation Coding Standards.

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[greptile-apps]

Greptile Summary

This PR fixes broken image and module links in physicsnemo/mesh/README.md by replacing repo-root-relative paths with paths relative to the README's own directory, and adds three documentation scripts (docs/img/mesh/airplane*.py) along with their rendered PNG outputs to serve as the new image sources.

Important Files Changed

Filename	Overview
physicsnemo/mesh/README.md	Fixes broken image links and module links by switching from repo-root-relative paths to paths relative to the README's directory; renames physicsnemo.mesh.examples → physicsnemo.mesh.primitives in the module listing.
docs/img/mesh/airplane.py	New script generating the plain wireframe airplane PNG; straightforward and correct.
docs/img/mesh/airplane_gaussian_curvature.py	Generates Gaussian curvature visualization; includes a 50-iteration Python-loop Laplacian smoother that is functional but slow for docs generation.
docs/img/mesh/airplane_mean_curvature.py	Generates mean curvature visualization; mirrors the Gaussian curvature script with the same smoothing loop pattern.

_{Reviews (1): Last reviewed commit: "Add airplane mesh visualizations and cur..." | Re-trigger Greptile}

[mnabian]

@peterdsharpe LGTM in overall. I'm just concerned about the placement of the .py files in the docs folder. Should those be moved to the relevant recipe in the examples directory?

[peterdsharpe]

No, those are intended to be there - those are just minimal scripts to generate the images themselves, so I like having those right next to the images (in case we want to later regenerate them.)

The same behavior has lots of examples in /examples/minimal/mesh and in the API docs, so user are covered there :)

[mnabian]

LGTM

[peterdsharpe]

/blossom-ci