docs: move pixi-build example to subfolder and restore cpp-sdl exampl… #6

Job	Run time
Cargo Machete	1m 2s
determine changes	6s
pre-commit	43s
build binary \| linux x86_64	1s
build binary \| macos x86_64	11m 46s
build binary \| macos aarch64	6m 31s
build binary \| windows aarch64	1s
build binary \| windows x86_64	1s
cargo test \| ubuntu	1s
cargo test \| macos aarch64	7m 7s
cargo test \| macos x86_64	14m 31s
cargo test \| windows	1s
cargo rustdoc \| ubuntu	3m 57s
cargo fmt \| ubuntu	16s
cargo clippy \| ubuntu	2m 13s
pytest integration \| macos aarch64	4m 48s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	1m 36s
pytest integration \| linux x86_64	0s
test wheel installation \| linux x86_64	0s
test wheel installation \| windows x86_64	0s
pytest integration \| windows x86_64	0s
	54m 41s

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