Add curvilinear how-to guide v4 #1854

Job	Run time
cache-pixi-lock / Generate output	1m 5s
Unit tests: ubuntu \| pixi run -e test-latest tests	5m 10s
Unit tests: ubuntu \| pixi run -e test-py311 tests	5m 29s
Unit tests: ubuntu \| pixi run -e test-minimum tests	5m 17s
Unit tests: ubuntu \| pixi run -e test-py313 tests	5m 17s
Unit tests: windows \| pixi run -e test-latest tests	13m 34s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	-1s
merge-test-artifacts	-1s
	35m 50s

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