Add Documentation on New NetCDF Input in GeoClaw

.gitignore

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+# -----------------------------------------------------------------------------
+# Sphinx build output
+# -----------------------------------------------------------------------------
+_build1
+
+# Generated API docs (if autogenerated)
+api/generated/
+
+# -----------------------------------------------------------------------------
+# Python
+# -----------------------------------------------------------------------------
+__pycache__/
+*.py[cod]
+*$py.class
+
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.coverage
+coverage.xml
+htmlcov/
+
+# -----------------------------------------------------------------------------
+# Virtual environments
+# -----------------------------------------------------------------------------
+.venv/
+venv/
+env/
+
+# -----------------------------------------------------------------------------
+# Jupyter
+# -----------------------------------------------------------------------------
+.ipynb_checkpoints/
+
+# -----------------------------------------------------------------------------
+# Documentation tooling caches
+# -----------------------------------------------------------------------------
+.doctrees/
+
+# If using sphinx-gallery
+auto_examples/
+
+# If using jupyter-cache / myst-nb
+.jupyter_cache/
+
+# -----------------------------------------------------------------------------
+# OS / editor files
+# -----------------------------------------------------------------------------
+.DS_Store
+Thumbs.db
+
+.vscode/
+.idea/
+
+# Vim
+*.swp
+*.swo
+
+# -----------------------------------------------------------------------------
+# Package managers / environments
+# -----------------------------------------------------------------------------
+# uv
+.uv/
+.pixi/
+conda-meta/