Add curvilinear how-to guide v4 #1858

Job	Run time
cache-pixi-lock / Generate output	11s
Unit tests: ubuntu \| pixi run -e test-py313 tests	5m 2s
Unit tests: ubuntu \| pixi run -e test-latest tests	4m 59s
Unit tests: windows \| pixi run -e test-latest tests	13m 47s
Unit tests: ubuntu \| pixi run -e test-minimum tests	5m 6s
Unit tests: ubuntu \| pixi run -e test-py311 tests	5m 36s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
TypeChecking: pixi run typing	-1s
merge-test-artifacts	0s
	34m 40s

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