Add missing example output images and animations

[camUrban]

Description

Restores accidentally removed output images and animations in docs/examples_expected_output/.

Motivation

Images and animations showing what to expect when running the example files were accidentally removed by the last PR.

Relevant Issues

None.

Changes

• Restores accidentally removed output images and animations in docs/examples_expected_output/.

New Dependencies

None.

Change Magnitude

Minor: Small change such as a bug fix, small enhancement, or documentation update.

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Checklist

• I am familiar with the current contribution guidelines.
• My branch is based on main and is up to date with the upstream main branch.
• All calculations use S.I. units.
• Code is formatted with black (line length = 88).
• Code is well documented with block comments where appropriate.
• Any external code, algorithms, or equations used have been cited in comments or docstrings.
• All new modules, classes, functions, and methods have docstrings in reStructuredText format, and are formatted using docformatter (--in-place --black). See the style guide for type hints and docstrings for more details.
• All new classes, functions, and methods in the pterasoftware package use type hints. See the style guide for type hints and docstrings for more details.
• If any major functionality was added or significantly changed, I have added or updated tests in the tests package.
• Code locally passes all tests in the tests package.
• After pushing, PR passes all automated checks (codespell, black, mypy, and tests).
• PR description links all relevant issues and follows this template.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.32%. Comparing base (9347cf6) to head (a9b37da).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   91.32%   91.32%           
=======================================
  Files          32       32           
  Lines        5818     5818           
=======================================
  Hits         5313     5313           
  Misses        505      505           

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