examples: Add a notebook demonstrating curvilinear FD#2404

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EdCaunt wants to merge 4 commits intomasterfrom curvilinear

+590

Commits on Jul 10, 2024

examples: Start work on curvilinear notebook
EdCaunt
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Commits on Jul 11, 2024

examples: Further work on variable-z example
EdCaunt
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Commits on Jul 12, 2024